diff --git a/lib/IDE/IDETypeChecking.cpp b/lib/IDE/IDETypeChecking.cpp
index 6f9793d1408ec..7b768a363f590 100644
--- a/lib/IDE/IDETypeChecking.cpp
+++ b/lib/IDE/IDETypeChecking.cpp
@@ -277,22 +277,17 @@ struct SynthesizedExtensionAnalyzer::Implementation {
   using MergeGroupVector = std::vector<ExtensionMergeGroup>;
 
   NominalTypeDecl *Target;
-  Type BaseType;
   DeclContext *DC;
   bool IncludeUnconditional;
   PrintOptions Options;
   MergeGroupVector AllGroups;
   ExtensionInfoMap InfoMap;
 
-  Implementation(NominalTypeDecl *Target,
-                 bool IncludeUnconditional,
-                 PrintOptions &&Options):
-  Target(Target),
-  BaseType(Target->getDeclaredInterfaceType()),
-  DC(Target),
-  IncludeUnconditional(IncludeUnconditional),
-  Options(std::move(Options)), AllGroups(MergeGroupVector()),
-  InfoMap(collectSynthesizedExtensionInfo(AllGroups)) {}
+  Implementation(NominalTypeDecl *Target, bool IncludeUnconditional,
+                 PrintOptions &&Options)
+      : Target(Target), DC(Target), IncludeUnconditional(IncludeUnconditional),
+        Options(std::move(Options)), AllGroups(MergeGroupVector()),
+        InfoMap(collectSynthesizedExtensionInfo(AllGroups)) {}
 
   unsigned countInherits(ExtensionDecl *ED) {
     SmallVector<InheritedEntry, 4> Results;
@@ -316,19 +311,24 @@ struct SynthesizedExtensionAnalyzer::Implementation {
     // extension SomeType: SomeProtocol where T: SomeProtocol {}. The former is
     // Ext and the latter is EnablingExt/Conf. Either of these can be
     // conditional in ways that need to be considered when merging.
-    auto conformanceIsConditional =
-        Conf && !Conf->getConditionalRequirements().empty();
-    if (!Ext->isConstrainedExtension() && !conformanceIsConditional) {
+    auto isConditionalEnablingExt =
+        Conf && EnablingExt && !Conf->getConditionalRequirements().empty();
+    if (!Ext->isConstrainedExtension() && !isConditionalEnablingExt) {
       if (IncludeUnconditional)
         Result.Ext = Ext;
       return {Result, MergeInfo};
     }
 
-    auto handleRequirements = [&](SubstitutionMap subMap,
-                                  ExtensionDecl *OwningExt,
+    auto handleRequirements = [&](ExtensionDecl *OwningExt,
                                   ArrayRef<Requirement> Reqs) {
-      ProtocolDecl *BaseProto = OwningExt->getInnermostDeclContext()
-        ->getSelfProtocolDecl();
+      ProtocolDecl *BaseProto = OwningExt->getSelfProtocolDecl();
+      // Substitute the base conforming type into a protocol's generic signature
+      // if needed.
+      SubstitutionMap subMap;
+      if (Conf && BaseProto) {
+        subMap = SubstitutionMap::getProtocolSubstitutions(
+            ProtocolConformanceRef(Conf));
+      }
       for (auto Req : Reqs) {
         // Skip protocol's Self : <Protocol> requirement.
         if (BaseProto &&
@@ -337,10 +337,13 @@ struct SynthesizedExtensionAnalyzer::Implementation {
             Req.getProtocolDecl() == BaseProto)
           continue;
 
-        if (!BaseType->isExistentialType()) {
+        if (subMap) {
           // Apply any substitutions we need to map the requirements from a
-          // a protocol extension to an extension on the conforming type.
-          Req = Req.subst(subMap);
+          // a protocol extension to an extension on the conforming type. We
+          // need to lookup conformances outside of the substitution map since
+          // the extension may introduce new conformance constraints.
+          Req = Req.subst(QuerySubstitutionMap{subMap},
+                          LookUpConformanceInModule());
           if (Req.hasError()) {
             // Substitution with interface type bases can only fail
             // if a concrete type fails to conform to a protocol.
@@ -353,6 +356,14 @@ struct SynthesizedExtensionAnalyzer::Implementation {
         if (Req.getKind() != RequirementKind::Layout)
           assert(!Req.getSecondType()->hasArchetype());
 
+        // FIXME: This doesn't correctly handle conformance requirements, e.g:
+        //
+        // extension P where X: Q, X.Y == Int {}
+        //
+        // Since the archetype we have for `X` doesn't necessarily have a
+        // conformance to `Q` in the conforming type's generic environment. This
+        // results in a substitution failure for `X.Y`.
+        // https://github.com/swiftlang/swift/issues/83564
         auto *env = Target->getGenericEnvironment();
         SmallVector<Requirement, 2> subReqs;
         subReqs.push_back(
@@ -385,30 +396,14 @@ struct SynthesizedExtensionAnalyzer::Implementation {
     };
 
     if (Ext->isConstrainedExtension()) {
-      // Get the substitutions from the generic signature of
-      // the extension to the interface types of the base type's
-      // declaration.
-      SubstitutionMap subMap;
-      if (!BaseType->isExistentialType()) {
-        if (auto *NTD = Ext->getExtendedNominal())
-          subMap = BaseType->getContextSubstitutionMap(NTD);
-      }
-
       assert(Ext->getGenericSignature() && "No generic signature.");
       auto GenericSig = Ext->getGenericSignature();
-      if (handleRequirements(subMap, Ext, GenericSig.getRequirements()))
+      if (handleRequirements(Ext, GenericSig.getRequirements()))
         return {Result, MergeInfo};
     }
 
-    if (Conf) {
-      SubstitutionMap subMap;
-      if (!BaseType->isExistentialType()) {
-        if (auto *NTD = EnablingExt->getExtendedNominal())
-          subMap = BaseType->getContextSubstitutionMap(NTD);
-      }
-      if (handleRequirements(subMap,
-                             EnablingExt,
-                             Conf->getConditionalRequirements()))
+    if (isConditionalEnablingExt) {
+      if (handleRequirements(EnablingExt, Conf->getConditionalRequirements()))
         return {Result, MergeInfo};
     }
 
@@ -479,7 +474,6 @@ struct SynthesizedExtensionAnalyzer::Implementation {
 
     ExtensionInfoMap InfoMap;
     ExtensionMergeInfoMap MergeInfoMap;
-    std::vector<NominalTypeDecl*> Unhandled;
 
     auto handleExtension = [&](ExtensionDecl *E, bool Synthesized,
                                ExtensionDecl *EnablingE,
@@ -500,31 +494,17 @@ struct SynthesizedExtensionAnalyzer::Implementation {
       }
     };
 
-    // We want to visit the protocols of any normal conformances we see, but
-    // we have to avoid doing this to self-conformances or we can end up with
-    // a cycle.  Otherwise this is cycle-proof on valid code.
-    // We also want to ignore inherited conformances. Members from these will
-    // be included in the class they were inherited from.
-    auto addConformance = [&](ProtocolConformance *Conf) {
-      if (isa<InheritedProtocolConformance>(Conf))
-        return;
-      auto RootConf = Conf->getRootConformance();
-      if (isa<NormalProtocolConformance>(RootConf))
-        Unhandled.push_back(RootConf->getProtocol());
-    };
+    for (auto *LocalConf : Target->getLocalConformances()) {
+      if (isa<InheritedProtocolConformance>(LocalConf))
+        continue;
 
-    for (auto *Conf : Target->getLocalConformances()) {
-      addConformance(Conf);
-    }
-    while (!Unhandled.empty()) {
-      NominalTypeDecl* Back = Unhandled.back();
-      Unhandled.pop_back();
-      for (ExtensionDecl *E : Back->getExtensions()) {
-        handleExtension(E, true, nullptr, nullptr);
-      }
-      for (auto *Conf : Back->getLocalConformances()) {
-        addConformance(Conf);
-      }
+      auto RootConf = LocalConf->getRootConformance();
+      auto *Conf = dyn_cast<NormalProtocolConformance>(RootConf);
+      if (!Conf)
+        continue;
+
+      for (auto *E : Conf->getProtocol()->getExtensions())
+        handleExtension(E, true, nullptr, Conf);
     }
 
     // Merge with actual extensions.
diff --git a/test/IDE/print_synthesized_extensions.swift b/test/IDE/print_synthesized_extensions.swift
index 37a0a21d02920..abab4d10c5f1f 100644
--- a/test/IDE/print_synthesized_extensions.swift
+++ b/test/IDE/print_synthesized_extensions.swift
@@ -241,9 +241,9 @@ extension S13 : P5 {
 }
 
 // CHECK1: <synthesized>extension <ref:Struct>S1</ref> where <ref:GenericTypeParam>T</ref> : <ref:module>print_synthesized_extensions</ref>.<ref:Protocol>P2</ref> {
-// CHECK1-NEXT:     <decl:Func>public func <loc>p2member()</loc></decl>
 // CHECK1-NEXT:     <decl:Func>public func <loc>ef1(<decl:Param>t: <ref:GenericTypeParam>T</ref></decl>)</loc></decl>
 // CHECK1-NEXT:     <decl:Func>public func <loc>ef2(<decl:Param>t: <ref:module>print_synthesized_extensions</ref>.<ref:Struct>S2</ref></decl>)</loc></decl>
+// CHECK1-NEXT:     <decl:Func>public func <loc>p2member()</loc></decl>
 // CHECK1-NEXT: }</synthesized>
 
 // CHECK2:  <synthesized>extension <ref:Struct>S1</ref> where <ref:GenericTypeParam>T</ref> : <ref:module>print_synthesized_extensions</ref>.<ref:Protocol>P3</ref>  {
@@ -410,4 +410,4 @@ extension S14 : P14 where repeat each T: Hashable {}
 
 // CHECK17:      <synthesized>extension <ref:Struct>S14</ref> {
 // CHECK17-NEXT:   <decl:Func>public func <loc>foo<each <ref:GenericTypeParam>T</ref>>(<decl:Param>_: repeat each <ref:GenericTypeParam>T</ref></decl>)</loc> where Pack{repeat each <ref:GenericTypeParam>T</ref>} : <ref:Protocol>Equatable</ref></decl>
-// CHECK17-NEXT: }</synthesized>
\ No newline at end of file
+// CHECK17-NEXT: }</synthesized>
diff --git a/test/IDE/print_synthesized_extensions_generics.swift b/test/IDE/print_synthesized_extensions_generics.swift
index b7fdbec74ec72..72d2f5bb30309 100644
--- a/test/IDE/print_synthesized_extensions_generics.swift
+++ b/test/IDE/print_synthesized_extensions_generics.swift
@@ -85,3 +85,21 @@ extension G : P2 {}
 // CHECK:      extension P2 where Self.T.T : print_synthesized_extensions_generics.A {
 // CHECK-NEXT:   func blah()
 // CHECK-NEXT: }
+
+public protocol P3 {
+  associatedtype A
+}
+public protocol P4 {
+  associatedtype B: P3
+}
+
+public struct S1<A> {}
+
+// Make sure we don't crash. Unfortunately we don't yet correctly output these
+// though.
+extension S1: P4 where A: P4, A.B.A == A {
+  public typealias B = A.B
+}
+extension P3 where A: P4, A.B.A == A {
+  public func foo() {}
+}
diff --git a/test/SourceKit/DocSupport/doc_clang_module.swift.response b/test/SourceKit/DocSupport/doc_clang_module.swift.response
index 2b018fe0704bd..2f8ce5e96e1bf 100644
--- a/test/SourceKit/DocSupport/doc_clang_module.swift.response
+++ b/test/SourceKit/DocSupport/doc_clang_module.swift.response
@@ -84,27 +84,6 @@ struct FooRuncingOptions : OptionSet {
     @inlinable init(arrayLiteral arrayLiteral: FooRuncingOptions...)
 }
 
-extension FooRuncingOptions {
-
-    @inlinable init<S>(_ sequence: S) where S : Sequence, FooRuncingOptions == S.Element
-
-    @inlinable mutating func subtract(_ other: FooRuncingOptions)
-
-    @inlinable func isSubset(of other: FooRuncingOptions) -> Bool
-
-    @inlinable func isSuperset(of other: FooRuncingOptions) -> Bool
-
-    @inlinable func isDisjoint(with other: FooRuncingOptions) -> Bool
-
-    @inlinable func subtracting(_ other: FooRuncingOptions) -> FooRuncingOptions
-
-    @inlinable var isEmpty: Bool { get }
-
-    @inlinable func isStrictSuperset(of other: FooRuncingOptions) -> Bool
-
-    @inlinable func isStrictSubset(of other: FooRuncingOptions) -> Bool
-}
-
 extension FooRuncingOptions {
 
     @inlinable func union(_ other: FooRuncingOptions) -> FooRuncingOptions
@@ -139,6 +118,27 @@ extension FooRuncingOptions {
     @inlinable mutating func formSymmetricDifference(_ other: FooRuncingOptions)
 }
 
+extension FooRuncingOptions {
+
+    @inlinable init<S>(_ sequence: S) where S : Sequence, FooRuncingOptions == S.Element
+
+    @inlinable mutating func subtract(_ other: FooRuncingOptions)
+
+    @inlinable func isSubset(of other: FooRuncingOptions) -> Bool
+
+    @inlinable func isSuperset(of other: FooRuncingOptions) -> Bool
+
+    @inlinable func isDisjoint(with other: FooRuncingOptions) -> Bool
+
+    @inlinable func subtracting(_ other: FooRuncingOptions) -> FooRuncingOptions
+
+    @inlinable var isEmpty: Bool { get }
+
+    @inlinable func isStrictSuperset(of other: FooRuncingOptions) -> Bool
+
+    @inlinable func isStrictSubset(of other: FooRuncingOptions) -> Bool
+}
+
 struct FooStruct1 {
 
     init()
@@ -1581,784 +1581,775 @@ var FooSubUnnamedEnumeratorA1: Int { get }
     key.length: 4
   },
   {
-    key.kind: source.lang.swift.ref.generic_type_param,
-    key.name: "S",
-    key.usr: "s:s10SetAlgebraPsEyxqd__ncSTRd__7ElementQyd__ACRtzlufc1SL_qd__mfp",
+    key.kind: source.lang.swift.syntaxtype.identifier,
     key.offset: 1836,
-    key.length: 1
+    key.length: 5
   },
   {
     key.kind: source.lang.swift.syntaxtype.argument,
-    key.offset: 1839,
+    key.offset: 1842,
     key.length: 1
   },
   {
     key.kind: source.lang.swift.syntaxtype.parameter,
-    key.offset: 1841,
-    key.length: 8
-  },
-  {
-    key.kind: source.lang.swift.ref.generic_type_param,
-    key.name: "S",
-    key.usr: "s:s10SetAlgebraPsEyxqd__ncSTRd__7ElementQyd__ACRtzlufc1SL_qd__mfp",
-    key.offset: 1851,
-    key.length: 1
-  },
-  {
-    key.kind: source.lang.swift.syntaxtype.keyword,
-    key.offset: 1854,
+    key.offset: 1844,
     key.length: 5
   },
-  {
-    key.kind: source.lang.swift.ref.generic_type_param,
-    key.name: "S",
-    key.usr: "s:s10SetAlgebraPsEyxqd__ncSTRd__7ElementQyd__ACRtzlufc1SL_qd__mfp",
-    key.offset: 1860,
-    key.length: 1
-  },
-  {
-    key.kind: source.lang.swift.ref.protocol,
-    key.name: "Sequence",
-    key.usr: "s:ST",
-    key.offset: 1864,
-    key.length: 8
-  },
   {
     key.kind: source.lang.swift.ref.struct,
     key.name: "FooRuncingOptions",
     key.usr: "c:@E@FooRuncingOptions",
-    key.offset: 1874,
+    key.offset: 1851,
     key.length: 17
   },
   {
-    key.kind: source.lang.swift.syntaxtype.operator,
-    key.offset: 1892,
-    key.length: 2
-  },
-  {
-    key.kind: source.lang.swift.ref.generic_type_param,
-    key.name: "S",
-    key.usr: "s:s10SetAlgebraPsEyxqd__ncSTRd__7ElementQyd__ACRtzlufc1SL_qd__mfp",
-    key.offset: 1895,
-    key.length: 1
-  },
-  {
-    key.kind: source.lang.swift.ref.associatedtype,
-    key.name: "Element",
-    key.usr: "s:ST7ElementQa",
-    key.offset: 1897,
-    key.length: 7
+    key.kind: source.lang.swift.ref.struct,
+    key.name: "FooRuncingOptions",
+    key.usr: "c:@E@FooRuncingOptions",
+    key.offset: 1873,
+    key.length: 17
   },
   {
     key.kind: source.lang.swift.syntaxtype.attribute.builtin,
-    key.offset: 1910,
+    key.offset: 1896,
     key.length: 10
   },
-  {
-    key.kind: source.lang.swift.syntaxtype.attribute.builtin,
-    key.offset: 1921,
-    key.length: 8
-  },
   {
     key.kind: source.lang.swift.syntaxtype.keyword,
-    key.offset: 1930,
+    key.offset: 1907,
     key.length: 4
   },
   {
     key.kind: source.lang.swift.syntaxtype.identifier,
-    key.offset: 1935,
-    key.length: 8
+    key.offset: 1912,
+    key.length: 12
   },
   {
     key.kind: source.lang.swift.syntaxtype.argument,
-    key.offset: 1944,
+    key.offset: 1925,
     key.length: 1
   },
   {
     key.kind: source.lang.swift.syntaxtype.parameter,
-    key.offset: 1946,
+    key.offset: 1927,
     key.length: 5
   },
   {
     key.kind: source.lang.swift.ref.struct,
     key.name: "FooRuncingOptions",
     key.usr: "c:@E@FooRuncingOptions",
-    key.offset: 1953,
+    key.offset: 1934,
+    key.length: 17
+  },
+  {
+    key.kind: source.lang.swift.ref.struct,
+    key.name: "FooRuncingOptions",
+    key.usr: "c:@E@FooRuncingOptions",
+    key.offset: 1956,
     key.length: 17
   },
   {
     key.kind: source.lang.swift.syntaxtype.attribute.builtin,
-    key.offset: 1977,
+    key.offset: 1979,
     key.length: 10
   },
   {
     key.kind: source.lang.swift.syntaxtype.keyword,
-    key.offset: 1988,
+    key.offset: 1990,
     key.length: 4
   },
   {
     key.kind: source.lang.swift.syntaxtype.identifier,
-    key.offset: 1993,
-    key.length: 8
+    key.offset: 1995,
+    key.length: 19
   },
   {
     key.kind: source.lang.swift.syntaxtype.argument,
-    key.offset: 2002,
-    key.length: 2
+    key.offset: 2015,
+    key.length: 1
   },
   {
     key.kind: source.lang.swift.syntaxtype.parameter,
-    key.offset: 2005,
+    key.offset: 2017,
     key.length: 5
   },
   {
     key.kind: source.lang.swift.ref.struct,
     key.name: "FooRuncingOptions",
     key.usr: "c:@E@FooRuncingOptions",
-    key.offset: 2012,
+    key.offset: 2024,
     key.length: 17
   },
   {
     key.kind: source.lang.swift.ref.struct,
-    key.name: "Bool",
-    key.usr: "s:Sb",
-    key.offset: 2034,
-    key.length: 4
-  },
-  {
-    key.kind: source.lang.swift.syntaxtype.attribute.builtin,
-    key.offset: 2044,
-    key.length: 10
+    key.name: "FooRuncingOptions",
+    key.usr: "c:@E@FooRuncingOptions",
+    key.offset: 2046,
+    key.length: 17
   },
   {
     key.kind: source.lang.swift.syntaxtype.keyword,
-    key.offset: 2055,
-    key.length: 4
-  },
-  {
-    key.kind: source.lang.swift.syntaxtype.identifier,
-    key.offset: 2060,
-    key.length: 10
-  },
-  {
-    key.kind: source.lang.swift.syntaxtype.argument,
-    key.offset: 2071,
-    key.length: 2
-  },
-  {
-    key.kind: source.lang.swift.syntaxtype.parameter,
-    key.offset: 2074,
-    key.length: 5
+    key.offset: 2067,
+    key.length: 9
   },
   {
     key.kind: source.lang.swift.ref.struct,
     key.name: "FooRuncingOptions",
     key.usr: "c:@E@FooRuncingOptions",
-    key.offset: 2081,
+    key.offset: 2077,
     key.length: 17
   },
-  {
-    key.kind: source.lang.swift.ref.struct,
-    key.name: "Bool",
-    key.usr: "s:Sb",
-    key.offset: 2103,
-    key.length: 4
-  },
   {
     key.kind: source.lang.swift.syntaxtype.attribute.builtin,
-    key.offset: 2113,
+    key.offset: 2102,
     key.length: 10
   },
   {
     key.kind: source.lang.swift.syntaxtype.keyword,
-    key.offset: 2124,
+    key.offset: 2113,
     key.length: 4
   },
   {
     key.kind: source.lang.swift.syntaxtype.identifier,
-    key.offset: 2129,
-    key.length: 10
+    key.offset: 2118,
+    key.length: 8
   },
   {
     key.kind: source.lang.swift.syntaxtype.argument,
-    key.offset: 2140,
-    key.length: 4
+    key.offset: 2127,
+    key.length: 1
   },
   {
     key.kind: source.lang.swift.syntaxtype.parameter,
-    key.offset: 2145,
-    key.length: 5
+    key.offset: 2129,
+    key.length: 6
   },
   {
     key.kind: source.lang.swift.ref.struct,
     key.name: "FooRuncingOptions",
     key.usr: "c:@E@FooRuncingOptions",
-    key.offset: 2152,
+    key.offset: 2137,
     key.length: 17
   },
   {
     key.kind: source.lang.swift.ref.struct,
     key.name: "Bool",
     key.usr: "s:Sb",
-    key.offset: 2174,
+    key.offset: 2159,
     key.length: 4
   },
   {
     key.kind: source.lang.swift.syntaxtype.attribute.builtin,
-    key.offset: 2184,
+    key.offset: 2169,
+    key.length: 18
+  },
+  {
+    key.kind: source.lang.swift.syntaxtype.attribute.builtin,
+    key.offset: 2192,
     key.length: 10
   },
+  {
+    key.kind: source.lang.swift.syntaxtype.attribute.builtin,
+    key.offset: 2203,
+    key.length: 8
+  },
   {
     key.kind: source.lang.swift.syntaxtype.keyword,
-    key.offset: 2195,
+    key.offset: 2212,
     key.length: 4
   },
   {
     key.kind: source.lang.swift.syntaxtype.identifier,
-    key.offset: 2200,
-    key.length: 11
+    key.offset: 2217,
+    key.length: 6
   },
   {
     key.kind: source.lang.swift.syntaxtype.argument,
-    key.offset: 2212,
+    key.offset: 2224,
     key.length: 1
   },
   {
     key.kind: source.lang.swift.syntaxtype.parameter,
-    key.offset: 2214,
-    key.length: 5
-  },
-  {
-    key.kind: source.lang.swift.ref.struct,
-    key.name: "FooRuncingOptions",
-    key.usr: "c:@E@FooRuncingOptions",
-    key.offset: 2221,
-    key.length: 17
+    key.offset: 2226,
+    key.length: 9
   },
   {
     key.kind: source.lang.swift.ref.struct,
     key.name: "FooRuncingOptions",
     key.usr: "c:@E@FooRuncingOptions",
-    key.offset: 2243,
+    key.offset: 2237,
     key.length: 17
   },
   {
-    key.kind: source.lang.swift.syntaxtype.attribute.builtin,
-    key.offset: 2266,
-    key.length: 10
+    key.kind: source.lang.swift.syntaxtype.identifier,
+    key.offset: 2260,
+    key.length: 8
   },
   {
-    key.kind: source.lang.swift.syntaxtype.keyword,
-    key.offset: 2277,
-    key.length: 3
+    key.kind: source.lang.swift.ref.struct,
+    key.name: "Bool",
+    key.usr: "s:Sb",
+    key.offset: 2270,
+    key.length: 4
   },
   {
     key.kind: source.lang.swift.syntaxtype.identifier,
-    key.offset: 2281,
-    key.length: 7
+    key.offset: 2276,
+    key.length: 17
   },
   {
     key.kind: source.lang.swift.ref.struct,
-    key.name: "Bool",
-    key.usr: "s:Sb",
-    key.offset: 2290,
-    key.length: 4
+    key.name: "FooRuncingOptions",
+    key.usr: "c:@E@FooRuncingOptions",
+    key.offset: 2295,
+    key.length: 17
   },
   {
-    key.kind: source.lang.swift.syntaxtype.keyword,
-    key.offset: 2297,
-    key.length: 3
+    key.kind: source.lang.swift.syntaxtype.attribute.builtin,
+    key.offset: 2319,
+    key.length: 18
   },
   {
     key.kind: source.lang.swift.syntaxtype.attribute.builtin,
-    key.offset: 2308,
+    key.offset: 2342,
     key.length: 10
   },
+  {
+    key.kind: source.lang.swift.syntaxtype.attribute.builtin,
+    key.offset: 2353,
+    key.length: 8
+  },
   {
     key.kind: source.lang.swift.syntaxtype.keyword,
-    key.offset: 2319,
+    key.offset: 2362,
     key.length: 4
   },
   {
     key.kind: source.lang.swift.syntaxtype.identifier,
-    key.offset: 2324,
-    key.length: 16
+    key.offset: 2367,
+    key.length: 6
   },
   {
     key.kind: source.lang.swift.syntaxtype.argument,
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@@ -5622,9 +5622,9 @@ var FooSubUnnamedEnumeratorA1: Int { get }
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+    key.doc.full_as_xml: "<Other><Name></Name><Declaration>extension FooRuncingOptions</Declaration><CommentParts><Abstract><Para><codeVoice>OptionSet</codeVoice> requirements for which default implementations are supplied.</Para></Abstract><Discussion><Note><Para>A type conforming to <codeVoice>OptionSet</codeVoice> can implement any of these initializers or methods, and those implementations will be used in lieu of these defaults.</Para></Note></Discussion></CommentParts></Other>",
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       key.kind: source.lang.swift.ref.struct,
@@ -5633,210 +5633,21 @@ var FooSubUnnamedEnumeratorA1: Int { get }
     },
     key.entities: [
       {
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-        key.name: "init(_:)",
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-            key.description: "FooRuncingOptions == S.Element"
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+        key.kind: source.lang.swift.decl.function.method.instance,
+        key.name: "union(_:)",
+        key.usr: "s:s9OptionSetPsE5unionyxxF::SYNTHESIZED::c:@E@FooRuncingOptions",
+        key.original_usr: "s:s9OptionSetPsE5unionyxxF",
+        key.doc.full_as_xml: "<Function><Name>union(_:)</Name><USR>s:s9OptionSetPsE5unionyxxF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable func union(_ other: FooRuncingOptions) -&gt; FooRuncingOptions</Declaration><CommentParts><Abstract><Para>Returns a new option set of the elements contained in this set, in the given set, or in both.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>An option set.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para>A new option set made up of the elements contained in this set, in <codeVoice>other</codeVoice>, or in both.</Para></ResultDiscussion><Discussion><Para>This example uses the <codeVoice>union(_:)</codeVoice> method to add two more shipping options to the default set.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[let defaultShipping = ShippingOptions.standard]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let memberShipping = defaultShipping.union([.secondDay, .priority])]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(memberShipping.contains(.priority))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"true\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
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+        key.length: 70,
+        key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>union</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>_</decl.var.parameter.argument_label> <decl.var.parameter.name>other</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>) -&gt; <decl.function.returntype><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.function.returntype></decl.function.method.instance>",
         key.entities: [
           {
             key.kind: source.lang.swift.decl.var.local,
             key.keyword: "_",
-            key.name: "sequence",
+            key.name: "other",
             key.offset: 1851,
-            key.length: 1
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-      {
-        key.kind: source.lang.swift.decl.function.method.instance,
-        key.name: "subtract(_:)",
-        key.usr: "s:s10SetAlgebraPsE8subtractyyxF::SYNTHESIZED::c:@E@FooRuncingOptions",
-        key.original_usr: "s:s10SetAlgebraPsE8subtractyyxF",
-        key.doc.full_as_xml: "<Function><Name>subtract(_:)</Name><USR>s:s10SetAlgebraPsE8subtractyyxF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable mutating func subtract(_ other: FooRuncingOptions)</Declaration><CommentParts><Abstract><Para>Removes the elements of the given set from this set.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>A set of the same type as the current set.</Para></Discussion></Parameter></Parameters><Discussion><Para>In the following example, the elements of the <codeVoice>employees</codeVoice> set that are also members of the <codeVoice>neighbors</codeVoice> set are removed. In particular, the names <codeVoice>&quot;Bethany&quot;</codeVoice> and <codeVoice>&quot;Eric&quot;</codeVoice> are removed from <codeVoice>employees</codeVoice>.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[var employees: Set = [\"Alicia\", \"Bethany\", \"Chris\", \"Diana\", \"Eric\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let neighbors: Set = [\"Bethany\", \"Eric\", \"Forlani\", \"Greta\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[employees.subtract(neighbors)]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(employees)]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"[\"Diana\", \"Chris\", \"Alicia\"]\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
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-        key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>mutating</syntaxtype.keyword> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>subtract</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>_</decl.var.parameter.argument_label> <decl.var.parameter.name>other</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>)</decl.function.method.instance>",
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-            key.keyword: "_",
-            key.name: "other",
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-        key.kind: source.lang.swift.decl.function.method.instance,
-        key.name: "isSubset(of:)",
-        key.usr: "s:s10SetAlgebraPsE8isSubset2ofSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions",
-        key.original_usr: "s:s10SetAlgebraPsE8isSubset2ofSbx_tF",
-        key.doc.full_as_xml: "<Function><Name>isSubset(of:)</Name><USR>s:s10SetAlgebraPsE8isSubset2ofSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable func isSubset(of other: FooRuncingOptions) -&gt; Bool</Declaration><CommentParts><Abstract><Para>Returns a Boolean value that indicates whether the set is a subset of another set.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>A set of the same type as the current set.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para><codeVoice>true</codeVoice> if the set is a subset of <codeVoice>other</codeVoice>; otherwise, <codeVoice>false</codeVoice>.</Para></ResultDiscussion><Discussion><Para>Set <emphasis>A</emphasis> is a subset of another set <emphasis>B</emphasis> if every member of <emphasis>A</emphasis> is also a member of <emphasis>B</emphasis>.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[let employees: Set = [\"Alicia\", \"Bethany\", \"Chris\", \"Diana\", \"Eric\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let attendees: Set = [\"Alicia\", \"Bethany\", \"Diana\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(attendees.isSubset(of: employees))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"true\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
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-        key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>isSubset</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>of</decl.var.parameter.argument_label> <decl.var.parameter.name>other</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>) -&gt; <decl.function.returntype><ref.struct usr=\"s:Sb\">Bool</ref.struct></decl.function.returntype></decl.function.method.instance>",
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-        key.kind: source.lang.swift.decl.function.method.instance,
-        key.name: "isSuperset(of:)",
-        key.usr: "s:s10SetAlgebraPsE10isSuperset2ofSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions",
-        key.original_usr: "s:s10SetAlgebraPsE10isSuperset2ofSbx_tF",
-        key.doc.full_as_xml: "<Function><Name>isSuperset(of:)</Name><USR>s:s10SetAlgebraPsE10isSuperset2ofSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable func isSuperset(of other: FooRuncingOptions) -&gt; Bool</Declaration><CommentParts><Abstract><Para>Returns a Boolean value that indicates whether the set is a superset of the given set.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>A set of the same type as the current set.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para><codeVoice>true</codeVoice> if the set is a superset of <codeVoice>other</codeVoice>; otherwise, <codeVoice>false</codeVoice>.</Para></ResultDiscussion><Discussion><Para>Set <emphasis>A</emphasis> is a superset of another set <emphasis>B</emphasis> if every member of <emphasis>B</emphasis> is also a member of <emphasis>A</emphasis>.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[let employees: Set = [\"Alicia\", \"Bethany\", \"Chris\", \"Diana\", \"Eric\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let attendees: Set = [\"Alicia\", \"Bethany\", \"Diana\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(employees.isSuperset(of: attendees))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"true\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
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-        key.length: 63,
-        key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>isSuperset</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>of</decl.var.parameter.argument_label> <decl.var.parameter.name>other</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>) -&gt; <decl.function.returntype><ref.struct usr=\"s:Sb\">Bool</ref.struct></decl.function.returntype></decl.function.method.instance>",
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-        key.name: "isDisjoint(with:)",
-        key.usr: "s:s10SetAlgebraPsE10isDisjoint4withSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions",
-        key.original_usr: "s:s10SetAlgebraPsE10isDisjoint4withSbx_tF",
-        key.doc.full_as_xml: "<Function><Name>isDisjoint(with:)</Name><USR>s:s10SetAlgebraPsE10isDisjoint4withSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable func isDisjoint(with other: FooRuncingOptions) -&gt; Bool</Declaration><CommentParts><Abstract><Para>Returns a Boolean value that indicates whether the set has no members in common with the given set.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>A set of the same type as the current set.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para><codeVoice>true</codeVoice> if the set has no elements in common with <codeVoice>other</codeVoice>; otherwise, <codeVoice>false</codeVoice>.</Para></ResultDiscussion><Discussion><Para>In the following example, the <codeVoice>employees</codeVoice> set is disjoint with the <codeVoice>visitors</codeVoice> set because no name appears in both sets.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[let employees: Set = [\"Alicia\", \"Bethany\", \"Chris\", \"Diana\", \"Eric\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let visitors: Set = [\"Marcia\", \"Nathaniel\", \"Olivia\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(employees.isDisjoint(with: visitors))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"true\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
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-        key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>isDisjoint</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>with</decl.var.parameter.argument_label> <decl.var.parameter.name>other</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>) -&gt; <decl.function.returntype><ref.struct usr=\"s:Sb\">Bool</ref.struct></decl.function.returntype></decl.function.method.instance>",
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-        key.kind: source.lang.swift.decl.function.method.instance,
-        key.name: "subtracting(_:)",
-        key.usr: "s:s10SetAlgebraPsE11subtractingyxxF::SYNTHESIZED::c:@E@FooRuncingOptions",
-        key.original_usr: "s:s10SetAlgebraPsE11subtractingyxxF",
-        key.doc.full_as_xml: "<Function><Name>subtracting(_:)</Name><USR>s:s10SetAlgebraPsE11subtractingyxxF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable func subtracting(_ other: FooRuncingOptions) -&gt; FooRuncingOptions</Declaration><CommentParts><Abstract><Para>Returns a new set containing the elements of this set that do not occur in the given set.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>A set of the same type as the current set.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para>A new set.</Para></ResultDiscussion><Discussion><Para>In the following example, the <codeVoice>nonNeighbors</codeVoice> set is made up of the elements of the <codeVoice>employees</codeVoice> set that are not elements of <codeVoice>neighbors</codeVoice>:</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[let employees: Set = [\"Alicia\", \"Bethany\", \"Chris\", \"Diana\", \"Eric\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let neighbors: Set = [\"Bethany\", \"Eric\", \"Forlani\", \"Greta\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let nonNeighbors = employees.subtracting(neighbors)]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(nonNeighbors)]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"[\"Diana\", \"Chris\", \"Alicia\"]\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
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-        key.name: "isEmpty",
-        key.usr: "s:s10SetAlgebraPsE7isEmptySbvp::SYNTHESIZED::c:@E@FooRuncingOptions",
-        key.original_usr: "s:s10SetAlgebraPsE7isEmptySbvp",
-        key.doc.full_as_xml: "<Other><Name>isEmpty</Name><USR>s:s10SetAlgebraPsE7isEmptySbvp::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable var isEmpty: Bool { get }</Declaration><CommentParts><Abstract><Para>A Boolean value that indicates whether the set has no elements.</Para></Abstract></CommentParts></Other>",
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-        key.fully_annotated_decl: "<decl.var.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>var</syntaxtype.keyword> <decl.name>isEmpty</decl.name>: <decl.var.type><ref.struct usr=\"s:Sb\">Bool</ref.struct></decl.var.type> { <syntaxtype.keyword>get</syntaxtype.keyword> }</decl.var.instance>"
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-      {
-        key.kind: source.lang.swift.decl.function.method.instance,
-        key.name: "isStrictSuperset(of:)",
-        key.usr: "s:s10SetAlgebraPsE16isStrictSuperset2ofSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions",
-        key.original_usr: "s:s10SetAlgebraPsE16isStrictSuperset2ofSbx_tF",
-        key.doc.full_as_xml: "<Function><Name>isStrictSuperset(of:)</Name><USR>s:s10SetAlgebraPsE16isStrictSuperset2ofSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable func isStrictSuperset(of other: FooRuncingOptions) -&gt; Bool</Declaration><CommentParts><Abstract><Para>Returns a Boolean value that indicates whether this set is a strict superset of the given set.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>A set of the same type as the current set.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para><codeVoice>true</codeVoice> if the set is a strict superset of <codeVoice>other</codeVoice>; otherwise, <codeVoice>false</codeVoice>.</Para></ResultDiscussion><Discussion><Para>Set <emphasis>A</emphasis> is a strict superset of another set <emphasis>B</emphasis> if every member of <emphasis>B</emphasis> is also a member of <emphasis>A</emphasis> and <emphasis>A</emphasis> contains at least one element that is <emphasis>not</emphasis> a member of <emphasis>B</emphasis>.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[let employees: Set = [\"Alicia\", \"Bethany\", \"Chris\", \"Diana\", \"Eric\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let attendees: Set = [\"Alicia\", \"Bethany\", \"Diana\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(employees.isStrictSuperset(of: attendees))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"true\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// A set is never a strict superset of itself:]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(employees.isStrictSuperset(of: employees))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"false\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
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-        key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>isStrictSuperset</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>of</decl.var.parameter.argument_label> <decl.var.parameter.name>other</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>) -&gt; <decl.function.returntype><ref.struct usr=\"s:Sb\">Bool</ref.struct></decl.function.returntype></decl.function.method.instance>",
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-            key.offset: 2351,
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-          }
-        ]
-      },
-      {
-        key.kind: source.lang.swift.decl.function.method.instance,
-        key.name: "isStrictSubset(of:)",
-        key.usr: "s:s10SetAlgebraPsE14isStrictSubset2ofSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions",
-        key.original_usr: "s:s10SetAlgebraPsE14isStrictSubset2ofSbx_tF",
-        key.doc.full_as_xml: "<Function><Name>isStrictSubset(of:)</Name><USR>s:s10SetAlgebraPsE14isStrictSubset2ofSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable func isStrictSubset(of other: FooRuncingOptions) -&gt; Bool</Declaration><CommentParts><Abstract><Para>Returns a Boolean value that indicates whether this set is a strict subset of the given set.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>A set of the same type as the current set.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para><codeVoice>true</codeVoice> if the set is a strict subset of <codeVoice>other</codeVoice>; otherwise, <codeVoice>false</codeVoice>.</Para></ResultDiscussion><Discussion><Para>Set <emphasis>A</emphasis> is a strict subset of another set <emphasis>B</emphasis> if every member of <emphasis>A</emphasis> is also a member of <emphasis>B</emphasis> and <emphasis>B</emphasis> contains at least one element that is not a member of <emphasis>A</emphasis>.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[let employees: Set = [\"Alicia\", \"Bethany\", \"Chris\", \"Diana\", \"Eric\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let attendees: Set = [\"Alicia\", \"Bethany\", \"Diana\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(attendees.isStrictSubset(of: employees))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"true\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// A set is never a strict subset of itself:]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(attendees.isStrictSubset(of: attendees))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"false\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
-        key.offset: 2383,
-        key.length: 67,
-        key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>isStrictSubset</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>of</decl.var.parameter.argument_label> <decl.var.parameter.name>other</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>) -&gt; <decl.function.returntype><ref.struct usr=\"s:Sb\">Bool</ref.struct></decl.function.returntype></decl.function.method.instance>",
-        key.entities: [
-          {
-            key.kind: source.lang.swift.decl.var.local,
-            key.keyword: "of",
-            key.name: "other",
-            key.offset: 2424,
-            key.length: 17
-          }
-        ]
-      }
-    ]
-  },
-  {
-    key.kind: source.lang.swift.decl.extension.struct,
-    key.doc.full_as_xml: "<Other><Name></Name><Declaration>extension FooRuncingOptions</Declaration><CommentParts><Abstract><Para><codeVoice>OptionSet</codeVoice> requirements for which default implementations are supplied.</Para></Abstract><Discussion><Note><Para>A type conforming to <codeVoice>OptionSet</codeVoice> can implement any of these initializers or methods, and those implementations will be used in lieu of these defaults.</Para></Note></Discussion></CommentParts></Other>",
-    key.offset: 2454,
-    key.length: 280,
-    key.fully_annotated_decl: "<syntaxtype.keyword>extension</syntaxtype.keyword> <ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct>",
-    key.extends: {
-      key.kind: source.lang.swift.ref.struct,
-      key.name: "FooRuncingOptions",
-      key.usr: "c:@E@FooRuncingOptions"
-    },
-    key.entities: [
-      {
-        key.kind: source.lang.swift.decl.function.method.instance,
-        key.name: "union(_:)",
-        key.usr: "s:s9OptionSetPsE5unionyxxF::SYNTHESIZED::c:@E@FooRuncingOptions",
-        key.original_usr: "s:s9OptionSetPsE5unionyxxF",
-        key.doc.full_as_xml: "<Function><Name>union(_:)</Name><USR>s:s9OptionSetPsE5unionyxxF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable func union(_ other: FooRuncingOptions) -&gt; FooRuncingOptions</Declaration><CommentParts><Abstract><Para>Returns a new option set of the elements contained in this set, in the given set, or in both.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>An option set.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para>A new option set made up of the elements contained in this set, in <codeVoice>other</codeVoice>, or in both.</Para></ResultDiscussion><Discussion><Para>This example uses the <codeVoice>union(_:)</codeVoice> method to add two more shipping options to the default set.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[let defaultShipping = ShippingOptions.standard]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let memberShipping = defaultShipping.union([.secondDay, .priority])]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(memberShipping.contains(.priority))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"true\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
-        key.offset: 2489,
-        key.length: 70,
-        key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>union</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>_</decl.var.parameter.argument_label> <decl.var.parameter.name>other</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>) -&gt; <decl.function.returntype><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.function.returntype></decl.function.method.instance>",
-        key.entities: [
-          {
-            key.kind: source.lang.swift.decl.var.local,
-            key.keyword: "_",
-            key.name: "other",
-            key.offset: 2520,
-            key.length: 17
+            key.length: 17
           }
         ]
       },
@@ -5846,7 +5657,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
         key.usr: "s:s9OptionSetPsE12intersectionyxxF::SYNTHESIZED::c:@E@FooRuncingOptions",
         key.original_usr: "s:s9OptionSetPsE12intersectionyxxF",
         key.doc.full_as_xml: "<Function><Name>intersection(_:)</Name><USR>s:s9OptionSetPsE12intersectionyxxF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable func intersection(_ other: FooRuncingOptions) -&gt; FooRuncingOptions</Declaration><CommentParts><Abstract><Para>Returns a new option set with only the elements contained in both this set and the given set.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>An option set.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para>A new option set with only the elements contained in both this set and <codeVoice>other</codeVoice>.</Para></ResultDiscussion><Discussion><Para>This example uses the <codeVoice>intersection(_:)</codeVoice> method to limit the available shipping options to what can be used with a PO Box destination.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[// Can only ship standard or priority to PO Boxes]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let poboxShipping: ShippingOptions = [.standard, .priority]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let memberShipping: ShippingOptions =]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[        [.standard, .priority, .secondDay]]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let availableOptions = memberShipping.intersection(poboxShipping)]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(availableOptions.contains(.priority))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"true\"]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(availableOptions.contains(.secondDay))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"false\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
-        key.offset: 2565,
+        key.offset: 1896,
         key.length: 77,
         key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>intersection</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>_</decl.var.parameter.argument_label> <decl.var.parameter.name>other</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>) -&gt; <decl.function.returntype><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.function.returntype></decl.function.method.instance>",
         key.entities: [
@@ -5854,7 +5665,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
             key.kind: source.lang.swift.decl.var.local,
             key.keyword: "_",
             key.name: "other",
-            key.offset: 2603,
+            key.offset: 1934,
             key.length: 17
           }
         ]
@@ -5865,7 +5676,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
         key.usr: "s:s9OptionSetPsE19symmetricDifferenceyxxF::SYNTHESIZED::c:@E@FooRuncingOptions",
         key.original_usr: "s:s9OptionSetPsE19symmetricDifferenceyxxF",
         key.doc.full_as_xml: "<Function><Name>symmetricDifference(_:)</Name><USR>s:s9OptionSetPsE19symmetricDifferenceyxxF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable func symmetricDifference(_ other: FooRuncingOptions) -&gt; FooRuncingOptions</Declaration><CommentParts><Abstract><Para>Returns a new option set with the elements contained in this set or in the given set, but not in both.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>An option set.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para>A new option set with only the elements contained in either this set or <codeVoice>other</codeVoice>, but not in both.</Para></ResultDiscussion></CommentParts></Function>",
-        key.offset: 2648,
+        key.offset: 1979,
         key.length: 84,
         key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>symmetricDifference</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>_</decl.var.parameter.argument_label> <decl.var.parameter.name>other</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>) -&gt; <decl.function.returntype><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.function.returntype></decl.function.method.instance>",
         key.entities: [
@@ -5873,7 +5684,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
             key.kind: source.lang.swift.decl.var.local,
             key.keyword: "_",
             key.name: "other",
-            key.offset: 2693,
+            key.offset: 2024,
             key.length: 17
           }
         ]
@@ -5883,7 +5694,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
   {
     key.kind: source.lang.swift.decl.extension.struct,
     key.doc.full_as_xml: "<Other><Name></Name><Declaration>extension FooRuncingOptions</Declaration><CommentParts><Abstract><Para><codeVoice>OptionSet</codeVoice> requirements for which default implementations are supplied when <codeVoice>Element == Self</codeVoice>, which is the default.</Para></Abstract><Discussion><Note><Para>A type conforming to <codeVoice>OptionSet</codeVoice> can implement any of these initializers or methods, and those implementations will be used in lieu of these defaults.</Para></Note></Discussion></CommentParts></Other>",
-    key.offset: 2736,
+    key.offset: 2067,
     key.length: 476,
     key.fully_annotated_decl: "<syntaxtype.keyword>extension</syntaxtype.keyword> <ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct>",
     key.extends: {
@@ -5898,7 +5709,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
         key.usr: "s:s9OptionSetPs7ElementQzRszrlE8containsySbxF::SYNTHESIZED::c:@E@FooRuncingOptions",
         key.original_usr: "s:s9OptionSetPs7ElementQzRszrlE8containsySbxF",
         key.doc.full_as_xml: "<Function><Name>contains(_:)</Name><USR>s:s9OptionSetPs7ElementQzRszrlE8containsySbxF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable func contains(_ member: FooRuncingOptions) -&gt; Bool</Declaration><CommentParts><Abstract><Para>Returns a Boolean value that indicates whether a given element is a member of the option set.</Para></Abstract><Parameters><Parameter><Name>member</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>The element to look for in the option set.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para><codeVoice>true</codeVoice> if the option set contains <codeVoice>member</codeVoice>; otherwise, <codeVoice>false</codeVoice>.</Para></ResultDiscussion><Discussion><Para>This example uses the <codeVoice>contains(_:)</codeVoice> method to check whether next-day shipping is in the <codeVoice>availableOptions</codeVoice> instance.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[let availableOptions = ShippingOptions.express]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[if availableOptions.contains(.nextDay) {]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[    print(\"Next day shipping available\")]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[}]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"Next day shipping available\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
-        key.offset: 2771,
+        key.offset: 2102,
         key.length: 61,
         key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>contains</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>_</decl.var.parameter.argument_label> <decl.var.parameter.name>member</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>) -&gt; <decl.function.returntype><ref.struct usr=\"s:Sb\">Bool</ref.struct></decl.function.returntype></decl.function.method.instance>",
         key.entities: [
@@ -5906,7 +5717,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
             key.kind: source.lang.swift.decl.var.local,
             key.keyword: "_",
             key.name: "member",
-            key.offset: 2806,
+            key.offset: 2137,
             key.length: 17
           }
         ]
@@ -5917,7 +5728,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
         key.usr: "s:s9OptionSetPs7ElementQzRszrlE6insertySb8inserted_x17memberAfterInserttxF::SYNTHESIZED::c:@E@FooRuncingOptions",
         key.original_usr: "s:s9OptionSetPs7ElementQzRszrlE6insertySb8inserted_x17memberAfterInserttxF",
         key.doc.full_as_xml: "<Function><Name>insert(_:)</Name><USR>s:s9OptionSetPs7ElementQzRszrlE6insertySb8inserted_x17memberAfterInserttxF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@discardableResult\n@inlinable mutating func insert(_ newMember: FooRuncingOptions) -&gt; (inserted: Bool, memberAfterInsert: FooRuncingOptions)</Declaration><CommentParts><Abstract><Para>Adds the given element to the option set if it is not already a member.</Para></Abstract><Parameters><Parameter><Name>newMember</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>The element to insert.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para><codeVoice>(true, newMember)</codeVoice> if <codeVoice>newMember</codeVoice> was not contained in <codeVoice>self</codeVoice>. Otherwise, returns <codeVoice>(false, oldMember)</codeVoice>, where <codeVoice>oldMember</codeVoice> is the member of the set equal to <codeVoice>newMember</codeVoice>.</Para></ResultDiscussion><Discussion><Para>In the following example, the <codeVoice>.secondDay</codeVoice> shipping option is added to the <codeVoice>freeOptions</codeVoice> option set if <codeVoice>purchasePrice</codeVoice> is greater than 50.0. For the <codeVoice>ShippingOptions</codeVoice> declaration, see the <codeVoice>OptionSet</codeVoice> protocol discussion.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[let purchasePrice = 87.55]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered><zCodeLineNumbered><![CDATA[var freeOptions: ShippingOptions = [.standard, .priority]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[if purchasePrice > 50 {]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[    freeOptions.insert(.secondDay)]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[}]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(freeOptions.contains(.secondDay))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"true\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
-        key.offset: 2838,
+        key.offset: 2169,
         key.length: 144,
         key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@discardableResult</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>mutating</syntaxtype.keyword> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>insert</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>_</decl.var.parameter.argument_label> <decl.var.parameter.name>newMember</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>) -&gt; <decl.function.returntype><tuple>(<tuple.element><tuple.element.argument_label>inserted</tuple.element.argument_label>: <tuple.element.type><ref.struct usr=\"s:Sb\">Bool</ref.struct></tuple.element.type></tuple.element>, <tuple.element><tuple.element.argument_label>memberAfterInsert</tuple.element.argument_label>: <tuple.element.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></tuple.element.type></tuple.element>)</tuple></decl.function.returntype></decl.function.method.instance>",
         key.entities: [
@@ -5925,7 +5736,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
             key.kind: source.lang.swift.decl.var.local,
             key.keyword: "_",
             key.name: "newMember",
-            key.offset: 2906,
+            key.offset: 2237,
             key.length: 17
           }
         ]
@@ -5936,7 +5747,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
         key.usr: "s:s9OptionSetPs7ElementQzRszrlE6removeyxSgxF::SYNTHESIZED::c:@E@FooRuncingOptions",
         key.original_usr: "s:s9OptionSetPs7ElementQzRszrlE6removeyxSgxF",
         key.doc.full_as_xml: "<Function><Name>remove(_:)</Name><USR>s:s9OptionSetPs7ElementQzRszrlE6removeyxSgxF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@discardableResult\n@inlinable mutating func remove(_ member: FooRuncingOptions) -&gt; FooRuncingOptions?</Declaration><CommentParts><Abstract><Para>Removes the given element and all elements subsumed by it.</Para></Abstract><Parameters><Parameter><Name>member</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>The element of the set to remove.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para>The intersection of <codeVoice>[member]</codeVoice> and the set, if the intersection was nonempty; otherwise, <codeVoice>nil</codeVoice>.</Para></ResultDiscussion><Discussion><Para>In the following example, the <codeVoice>.priority</codeVoice> shipping option is removed from the <codeVoice>options</codeVoice> option set. Attempting to remove the same shipping option a second time results in <codeVoice>nil</codeVoice>, because <codeVoice>options</codeVoice> no longer contains <codeVoice>.priority</codeVoice> as a member.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[var options: ShippingOptions = [.secondDay, .priority]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let priorityOption = options.remove(.priority)]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(priorityOption == .priority)]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"true\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(options.remove(.priority))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"nil\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing><Para>In the next example, the <codeVoice>.express</codeVoice> element is passed to <codeVoice>remove(_:)</codeVoice>. Although <codeVoice>.express</codeVoice> is not a member of <codeVoice>options</codeVoice>, <codeVoice>.express</codeVoice> subsumes the remaining <codeVoice>.secondDay</codeVoice> element of the option set. Therefore, <codeVoice>options</codeVoice> is emptied and the intersection between <codeVoice>.express</codeVoice> and <codeVoice>options</codeVoice> is returned.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[let expressOption = options.remove(.express)]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(expressOption == .express)]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"false\"]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(expressOption == .secondDay)]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"true\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
-        key.offset: 2988,
+        key.offset: 2319,
         key.length: 105,
         key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@discardableResult</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>mutating</syntaxtype.keyword> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>remove</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>_</decl.var.parameter.argument_label> <decl.var.parameter.name>member</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>) -&gt; <decl.function.returntype><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct>?</decl.function.returntype></decl.function.method.instance>",
         key.entities: [
@@ -5944,7 +5755,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
             key.kind: source.lang.swift.decl.var.local,
             key.keyword: "_",
             key.name: "member",
-            key.offset: 3053,
+            key.offset: 2384,
             key.length: 17
           }
         ]
@@ -5955,7 +5766,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
         key.usr: "s:s9OptionSetPs7ElementQzRszrlE6update4withxSgx_tF::SYNTHESIZED::c:@E@FooRuncingOptions",
         key.original_usr: "s:s9OptionSetPs7ElementQzRszrlE6update4withxSgx_tF",
         key.doc.full_as_xml: "<Function><Name>update(with:)</Name><USR>s:s9OptionSetPs7ElementQzRszrlE6update4withxSgx_tF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@discardableResult\n@inlinable mutating func update(with newMember: FooRuncingOptions) -&gt; FooRuncingOptions?</Declaration><CommentParts><Abstract><Para>Inserts the given element into the set.</Para></Abstract><ResultDiscussion><Para>The intersection of <codeVoice>[newMember]</codeVoice> and the set if the intersection was nonempty; otherwise, <codeVoice>nil</codeVoice>.</Para></ResultDiscussion><Discussion><Para>If <codeVoice>newMember</codeVoice> is not contained in the set but subsumes current members of the set, the subsumed members are returned.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[var options: ShippingOptions = [.secondDay, .priority]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let replaced = options.update(with: .express)]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(replaced == .secondDay)]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"true\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
-        key.offset: 3099,
+        key.offset: 2430,
         key.length: 111,
         key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@discardableResult</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>mutating</syntaxtype.keyword> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>update</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>with</decl.var.parameter.argument_label> <decl.var.parameter.name>newMember</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>) -&gt; <decl.function.returntype><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct>?</decl.function.returntype></decl.function.method.instance>",
         key.entities: [
@@ -5963,7 +5774,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
             key.kind: source.lang.swift.decl.var.local,
             key.keyword: "with",
             key.name: "newMember",
-            key.offset: 3170,
+            key.offset: 2501,
             key.length: 17
           }
         ]
@@ -5973,7 +5784,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
   {
     key.kind: source.lang.swift.decl.extension.struct,
     key.doc.full_as_xml: "<Other><Name></Name><Declaration>extension FooRuncingOptions</Declaration><CommentParts><Abstract><Para><codeVoice>OptionSet</codeVoice> requirements for which default implementations are supplied when <codeVoice>RawValue</codeVoice> conforms to <codeVoice>FixedWidthInteger</codeVoice>, which is the usual case.  Each distinct bit of an option set’s <codeVoice>.rawValue</codeVoice> corresponds to a disjoint value of the <codeVoice>OptionSet</codeVoice>.</Para></Abstract><Discussion><Note><Para>A type conforming to <codeVoice>OptionSet</codeVoice> can implement any of these initializers or methods, and those implementations will be used in lieu of these defaults.</Para></Note><List-Bullet><Item><Para><codeVoice>union</codeVoice> is implemented as a bitwise “or” (<codeVoice>|</codeVoice>) of <codeVoice>rawValue</codeVoice>s</Para></Item><Item><Para><codeVoice>intersection</codeVoice> is implemented as a bitwise “and” (<codeVoice>&amp;</codeVoice>) of <codeVoice>rawValue</codeVoice>s</Para></Item><Item><Para><codeVoice>symmetricDifference</codeVoice> is implemented as a bitwise “exclusive or” (<codeVoice>^</codeVoice>) of <codeVoice>rawValue</codeVoice>s</Para></Item></List-Bullet></Discussion></CommentParts></Other>",
-    key.offset: 3214,
+    key.offset: 2545,
     key.length: 279,
     key.fully_annotated_decl: "<syntaxtype.keyword>extension</syntaxtype.keyword> <ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct>",
     key.extends: {
@@ -5988,7 +5799,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
         key.usr: "s:s9OptionSetPss17FixedWidthInteger8RawValueRpzrlExycfc::SYNTHESIZED::c:@E@FooRuncingOptions",
         key.original_usr: "s:s9OptionSetPss17FixedWidthInteger8RawValueRpzrlExycfc",
         key.doc.full_as_xml: "<Function><Name>init()</Name><USR>s:s9OptionSetPss17FixedWidthInteger8RawValueRpzrlExycfc::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable init()</Declaration><CommentParts><Abstract><Para>Creates an empty option set.</Para></Abstract><Discussion><Para>This initializer creates an option set with a raw value of zero.</Para></Discussion></CommentParts></Function>",
-        key.offset: 3249,
+        key.offset: 2580,
         key.length: 17,
         key.fully_annotated_decl: "<decl.function.constructor><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>init</syntaxtype.keyword>()</decl.function.constructor>"
       },
@@ -5998,7 +5809,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
         key.usr: "s:s9OptionSetPss17FixedWidthInteger8RawValueRpzrlE9formUnionyyxF::SYNTHESIZED::c:@E@FooRuncingOptions",
         key.original_usr: "s:s9OptionSetPss17FixedWidthInteger8RawValueRpzrlE9formUnionyyxF",
         key.doc.full_as_xml: "<Function><Name>formUnion(_:)</Name><USR>s:s9OptionSetPss17FixedWidthInteger8RawValueRpzrlE9formUnionyyxF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable mutating func formUnion(_ other: FooRuncingOptions)</Declaration><CommentParts><Abstract><Para>Inserts the elements of another set into this option set.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>An option set.</Para></Discussion></Parameter></Parameters><Discussion><Para>This method is implemented as a <codeVoice>|</codeVoice> (bitwise OR) operation on the two sets’ raw values.</Para></Discussion></CommentParts></Function>",
-        key.offset: 3272,
+        key.offset: 2603,
         key.length: 62,
         key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>mutating</syntaxtype.keyword> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>formUnion</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>_</decl.var.parameter.argument_label> <decl.var.parameter.name>other</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>)</decl.function.method.instance>",
         key.entities: [
@@ -6006,7 +5817,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
             key.kind: source.lang.swift.decl.var.local,
             key.keyword: "_",
             key.name: "other",
-            key.offset: 3316,
+            key.offset: 2647,
             key.length: 17
           }
         ]
@@ -6017,7 +5828,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
         key.usr: "s:s9OptionSetPss17FixedWidthInteger8RawValueRpzrlE16formIntersectionyyxF::SYNTHESIZED::c:@E@FooRuncingOptions",
         key.original_usr: "s:s9OptionSetPss17FixedWidthInteger8RawValueRpzrlE16formIntersectionyyxF",
         key.doc.full_as_xml: "<Function><Name>formIntersection(_:)</Name><USR>s:s9OptionSetPss17FixedWidthInteger8RawValueRpzrlE16formIntersectionyyxF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable mutating func formIntersection(_ other: FooRuncingOptions)</Declaration><CommentParts><Abstract><Para>Removes all elements of this option set that are not also present in the given set.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>An option set.</Para></Discussion></Parameter></Parameters><Discussion><Para>This method is implemented as a <codeVoice>&amp;</codeVoice> (bitwise AND) operation on the two sets’ raw values.</Para></Discussion></CommentParts></Function>",
-        key.offset: 3340,
+        key.offset: 2671,
         key.length: 69,
         key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>mutating</syntaxtype.keyword> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>formIntersection</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>_</decl.var.parameter.argument_label> <decl.var.parameter.name>other</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>)</decl.function.method.instance>",
         key.entities: [
@@ -6025,7 +5836,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
             key.kind: source.lang.swift.decl.var.local,
             key.keyword: "_",
             key.name: "other",
-            key.offset: 3391,
+            key.offset: 2722,
             key.length: 17
           }
         ]
@@ -6036,7 +5847,7 @@ var FooSubUnnamedEnumeratorA1: Int { get }
         key.usr: "s:s9OptionSetPss17FixedWidthInteger8RawValueRpzrlE23formSymmetricDifferenceyyxF::SYNTHESIZED::c:@E@FooRuncingOptions",
         key.original_usr: "s:s9OptionSetPss17FixedWidthInteger8RawValueRpzrlE23formSymmetricDifferenceyyxF",
         key.doc.full_as_xml: "<Function><Name>formSymmetricDifference(_:)</Name><USR>s:s9OptionSetPss17FixedWidthInteger8RawValueRpzrlE23formSymmetricDifferenceyyxF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable mutating func formSymmetricDifference(_ other: FooRuncingOptions)</Declaration><CommentParts><Abstract><Para>Replaces this set with a new set containing all elements contained in either this set or the given set, but not in both.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>An option set.</Para></Discussion></Parameter></Parameters><Discussion><Para>This method is implemented as a <codeVoice>^</codeVoice> (bitwise XOR) operation on the two sets’ raw values.</Para></Discussion></CommentParts></Function>",
-        key.offset: 3415,
+        key.offset: 2746,
         key.length: 76,
         key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>mutating</syntaxtype.keyword> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>formSymmetricDifference</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>_</decl.var.parameter.argument_label> <decl.var.parameter.name>other</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>)</decl.function.method.instance>",
         key.entities: [
@@ -6044,7 +5855,196 @@ var FooSubUnnamedEnumeratorA1: Int { get }
             key.kind: source.lang.swift.decl.var.local,
             key.keyword: "_",
             key.name: "other",
-            key.offset: 3473,
+            key.offset: 2804,
+            key.length: 17
+          }
+        ]
+      }
+    ]
+  },
+  {
+    key.kind: source.lang.swift.decl.extension.struct,
+    key.doc.full_as_xml: "<Other><Name></Name><Declaration>extension FooRuncingOptions</Declaration><CommentParts><Abstract><Para><codeVoice>SetAlgebra</codeVoice> requirements for which default implementations are supplied.</Para></Abstract><Discussion><Note><Para>A type conforming to <codeVoice>SetAlgebra</codeVoice> can implement any of these initializers or methods, and those implementations will be used in lieu of these defaults.</Para></Note></Discussion></CommentParts></Other>",
+    key.offset: 2826,
+    key.length: 667,
+    key.fully_annotated_decl: "<syntaxtype.keyword>extension</syntaxtype.keyword> <ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct>",
+    key.extends: {
+      key.kind: source.lang.swift.ref.struct,
+      key.name: "FooRuncingOptions",
+      key.usr: "c:@E@FooRuncingOptions"
+    },
+    key.entities: [
+      {
+        key.kind: source.lang.swift.decl.function.constructor,
+        key.name: "init(_:)",
+        key.usr: "s:s10SetAlgebraPsEyxqd__ncSTRd__7ElementQyd__ACRtzlufc::SYNTHESIZED::c:@E@FooRuncingOptions",
+        key.original_usr: "s:s10SetAlgebraPsEyxqd__ncSTRd__7ElementQyd__ACRtzlufc",
+        key.generic_params: [
+          {
+            key.name: "S"
+          }
+        ],
+        key.generic_requirements: [
+          {
+            key.description: "S : Sequence"
+          },
+          {
+            key.description: "FooRuncingOptions == S.Element"
+          }
+        ],
+        key.doc.full_as_xml: "<Function><Name>init(_:)</Name><USR>s:s10SetAlgebraPsEyxqd__ncSTRd__7ElementQyd__ACRtzlufc::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable init&lt;S&gt;(_ sequence: S) where S : Sequence, FooRuncingOptions == S.Element</Declaration><CommentParts><Abstract><Para>Creates a new set from a finite sequence of items.</Para></Abstract><Parameters><Parameter><Name>sequence</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>The elements to use as members of the new set.</Para></Discussion></Parameter></Parameters><Discussion><Para>Use this initializer to create a new set from an existing sequence, like an array or a range:</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[let validIndices = Set(0..<7).subtracting([2, 4, 5])]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(validIndices)]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"[6, 0, 1, 3]\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
+        key.offset: 2861,
+        key.length: 84,
+        key.fully_annotated_decl: "<decl.function.constructor><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>init</syntaxtype.keyword>&lt;<ref.generic_type_param usr=\"s:s10SetAlgebraPsEyxqd__ncSTRd__7ElementQyd__ACRtzlufc1SL_qd__mfp\">S</ref.generic_type_param>&gt;(<decl.var.parameter><decl.var.parameter.argument_label>_</decl.var.parameter.argument_label> <decl.var.parameter.name>sequence</decl.var.parameter.name>: <decl.var.parameter.type><ref.generic_type_param usr=\"s:s10SetAlgebraPsEyxqd__ncSTRd__7ElementQyd__ACRtzlufc1SL_qd__mfp\">S</ref.generic_type_param></decl.var.parameter.type></decl.var.parameter>) <syntaxtype.keyword>where</syntaxtype.keyword> <decl.generic_type_requirement><ref.generic_type_param usr=\"s:s10SetAlgebraPsEyxqd__ncSTRd__7ElementQyd__ACRtzlufc1SL_qd__mfp\">S</ref.generic_type_param> : <ref.protocol usr=\"s:ST\">Sequence</ref.protocol></decl.generic_type_requirement>, <decl.generic_type_requirement><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct> == <ref.generic_type_param usr=\"s:s10SetAlgebraPsEyxqd__ncSTRd__7ElementQyd__ACRtzlufc1SL_qd__mfp\">S</ref.generic_type_param>.<ref.associatedtype usr=\"s:ST7ElementQa\">Element</ref.associatedtype></decl.generic_type_requirement></decl.function.constructor>",
+        key.entities: [
+          {
+            key.kind: source.lang.swift.decl.var.local,
+            key.keyword: "_",
+            key.name: "sequence",
+            key.offset: 2892,
+            key.length: 1
+          }
+        ]
+      },
+      {
+        key.kind: source.lang.swift.decl.function.method.instance,
+        key.name: "subtract(_:)",
+        key.usr: "s:s10SetAlgebraPsE8subtractyyxF::SYNTHESIZED::c:@E@FooRuncingOptions",
+        key.original_usr: "s:s10SetAlgebraPsE8subtractyyxF",
+        key.doc.full_as_xml: "<Function><Name>subtract(_:)</Name><USR>s:s10SetAlgebraPsE8subtractyyxF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable mutating func subtract(_ other: FooRuncingOptions)</Declaration><CommentParts><Abstract><Para>Removes the elements of the given set from this set.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>A set of the same type as the current set.</Para></Discussion></Parameter></Parameters><Discussion><Para>In the following example, the elements of the <codeVoice>employees</codeVoice> set that are also members of the <codeVoice>neighbors</codeVoice> set are removed. In particular, the names <codeVoice>&quot;Bethany&quot;</codeVoice> and <codeVoice>&quot;Eric&quot;</codeVoice> are removed from <codeVoice>employees</codeVoice>.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[var employees: Set = [\"Alicia\", \"Bethany\", \"Chris\", \"Diana\", \"Eric\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let neighbors: Set = [\"Bethany\", \"Eric\", \"Forlani\", \"Greta\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[employees.subtract(neighbors)]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(employees)]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"[\"Diana\", \"Chris\", \"Alicia\"]\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
+        key.offset: 2951,
+        key.length: 61,
+        key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>mutating</syntaxtype.keyword> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>subtract</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>_</decl.var.parameter.argument_label> <decl.var.parameter.name>other</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>)</decl.function.method.instance>",
+        key.entities: [
+          {
+            key.kind: source.lang.swift.decl.var.local,
+            key.keyword: "_",
+            key.name: "other",
+            key.offset: 2994,
+            key.length: 17
+          }
+        ]
+      },
+      {
+        key.kind: source.lang.swift.decl.function.method.instance,
+        key.name: "isSubset(of:)",
+        key.usr: "s:s10SetAlgebraPsE8isSubset2ofSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions",
+        key.original_usr: "s:s10SetAlgebraPsE8isSubset2ofSbx_tF",
+        key.doc.full_as_xml: "<Function><Name>isSubset(of:)</Name><USR>s:s10SetAlgebraPsE8isSubset2ofSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable func isSubset(of other: FooRuncingOptions) -&gt; Bool</Declaration><CommentParts><Abstract><Para>Returns a Boolean value that indicates whether the set is a subset of another set.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>A set of the same type as the current set.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para><codeVoice>true</codeVoice> if the set is a subset of <codeVoice>other</codeVoice>; otherwise, <codeVoice>false</codeVoice>.</Para></ResultDiscussion><Discussion><Para>Set <emphasis>A</emphasis> is a subset of another set <emphasis>B</emphasis> if every member of <emphasis>A</emphasis> is also a member of <emphasis>B</emphasis>.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[let employees: Set = [\"Alicia\", \"Bethany\", \"Chris\", \"Diana\", \"Eric\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let attendees: Set = [\"Alicia\", \"Bethany\", \"Diana\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(attendees.isSubset(of: employees))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"true\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
+        key.offset: 3018,
+        key.length: 61,
+        key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>isSubset</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>of</decl.var.parameter.argument_label> <decl.var.parameter.name>other</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>) -&gt; <decl.function.returntype><ref.struct usr=\"s:Sb\">Bool</ref.struct></decl.function.returntype></decl.function.method.instance>",
+        key.entities: [
+          {
+            key.kind: source.lang.swift.decl.var.local,
+            key.keyword: "of",
+            key.name: "other",
+            key.offset: 3053,
+            key.length: 17
+          }
+        ]
+      },
+      {
+        key.kind: source.lang.swift.decl.function.method.instance,
+        key.name: "isSuperset(of:)",
+        key.usr: "s:s10SetAlgebraPsE10isSuperset2ofSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions",
+        key.original_usr: "s:s10SetAlgebraPsE10isSuperset2ofSbx_tF",
+        key.doc.full_as_xml: "<Function><Name>isSuperset(of:)</Name><USR>s:s10SetAlgebraPsE10isSuperset2ofSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable func isSuperset(of other: FooRuncingOptions) -&gt; Bool</Declaration><CommentParts><Abstract><Para>Returns a Boolean value that indicates whether the set is a superset of the given set.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>A set of the same type as the current set.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para><codeVoice>true</codeVoice> if the set is a superset of <codeVoice>other</codeVoice>; otherwise, <codeVoice>false</codeVoice>.</Para></ResultDiscussion><Discussion><Para>Set <emphasis>A</emphasis> is a superset of another set <emphasis>B</emphasis> if every member of <emphasis>B</emphasis> is also a member of <emphasis>A</emphasis>.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[let employees: Set = [\"Alicia\", \"Bethany\", \"Chris\", \"Diana\", \"Eric\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let attendees: Set = [\"Alicia\", \"Bethany\", \"Diana\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(employees.isSuperset(of: attendees))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"true\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
+        key.offset: 3085,
+        key.length: 63,
+        key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>isSuperset</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>of</decl.var.parameter.argument_label> <decl.var.parameter.name>other</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>) -&gt; <decl.function.returntype><ref.struct usr=\"s:Sb\">Bool</ref.struct></decl.function.returntype></decl.function.method.instance>",
+        key.entities: [
+          {
+            key.kind: source.lang.swift.decl.var.local,
+            key.keyword: "of",
+            key.name: "other",
+            key.offset: 3122,
+            key.length: 17
+          }
+        ]
+      },
+      {
+        key.kind: source.lang.swift.decl.function.method.instance,
+        key.name: "isDisjoint(with:)",
+        key.usr: "s:s10SetAlgebraPsE10isDisjoint4withSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions",
+        key.original_usr: "s:s10SetAlgebraPsE10isDisjoint4withSbx_tF",
+        key.doc.full_as_xml: "<Function><Name>isDisjoint(with:)</Name><USR>s:s10SetAlgebraPsE10isDisjoint4withSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable func isDisjoint(with other: FooRuncingOptions) -&gt; Bool</Declaration><CommentParts><Abstract><Para>Returns a Boolean value that indicates whether the set has no members in common with the given set.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>A set of the same type as the current set.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para><codeVoice>true</codeVoice> if the set has no elements in common with <codeVoice>other</codeVoice>; otherwise, <codeVoice>false</codeVoice>.</Para></ResultDiscussion><Discussion><Para>In the following example, the <codeVoice>employees</codeVoice> set is disjoint with the <codeVoice>visitors</codeVoice> set because no name appears in both sets.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[let employees: Set = [\"Alicia\", \"Bethany\", \"Chris\", \"Diana\", \"Eric\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let visitors: Set = [\"Marcia\", \"Nathaniel\", \"Olivia\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(employees.isDisjoint(with: visitors))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"true\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
+        key.offset: 3154,
+        key.length: 65,
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+        key.kind: source.lang.swift.decl.function.method.instance,
+        key.name: "subtracting(_:)",
+        key.usr: "s:s10SetAlgebraPsE11subtractingyxxF::SYNTHESIZED::c:@E@FooRuncingOptions",
+        key.original_usr: "s:s10SetAlgebraPsE11subtractingyxxF",
+        key.doc.full_as_xml: "<Function><Name>subtracting(_:)</Name><USR>s:s10SetAlgebraPsE11subtractingyxxF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable func subtracting(_ other: FooRuncingOptions) -&gt; FooRuncingOptions</Declaration><CommentParts><Abstract><Para>Returns a new set containing the elements of this set that do not occur in the given set.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>A set of the same type as the current set.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para>A new set.</Para></ResultDiscussion><Discussion><Para>In the following example, the <codeVoice>nonNeighbors</codeVoice> set is made up of the elements of the <codeVoice>employees</codeVoice> set that are not elements of <codeVoice>neighbors</codeVoice>:</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[let employees: Set = [\"Alicia\", \"Bethany\", \"Chris\", \"Diana\", \"Eric\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let neighbors: Set = [\"Bethany\", \"Eric\", \"Forlani\", \"Greta\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let nonNeighbors = employees.subtracting(neighbors)]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(nonNeighbors)]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"[\"Diana\", \"Chris\", \"Alicia\"]\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
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+      {
+        key.kind: source.lang.swift.decl.var.instance,
+        key.name: "isEmpty",
+        key.usr: "s:s10SetAlgebraPsE7isEmptySbvp::SYNTHESIZED::c:@E@FooRuncingOptions",
+        key.original_usr: "s:s10SetAlgebraPsE7isEmptySbvp",
+        key.doc.full_as_xml: "<Other><Name>isEmpty</Name><USR>s:s10SetAlgebraPsE7isEmptySbvp::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable var isEmpty: Bool { get }</Declaration><CommentParts><Abstract><Para>A Boolean value that indicates whether the set has no elements.</Para></Abstract></CommentParts></Other>",
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+        key.fully_annotated_decl: "<decl.var.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>var</syntaxtype.keyword> <decl.name>isEmpty</decl.name>: <decl.var.type><ref.struct usr=\"s:Sb\">Bool</ref.struct></decl.var.type> { <syntaxtype.keyword>get</syntaxtype.keyword> }</decl.var.instance>"
+      },
+      {
+        key.kind: source.lang.swift.decl.function.method.instance,
+        key.name: "isStrictSuperset(of:)",
+        key.usr: "s:s10SetAlgebraPsE16isStrictSuperset2ofSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions",
+        key.original_usr: "s:s10SetAlgebraPsE16isStrictSuperset2ofSbx_tF",
+        key.doc.full_as_xml: "<Function><Name>isStrictSuperset(of:)</Name><USR>s:s10SetAlgebraPsE16isStrictSuperset2ofSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable func isStrictSuperset(of other: FooRuncingOptions) -&gt; Bool</Declaration><CommentParts><Abstract><Para>Returns a Boolean value that indicates whether this set is a strict superset of the given set.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>A set of the same type as the current set.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para><codeVoice>true</codeVoice> if the set is a strict superset of <codeVoice>other</codeVoice>; otherwise, <codeVoice>false</codeVoice>.</Para></ResultDiscussion><Discussion><Para>Set <emphasis>A</emphasis> is a strict superset of another set <emphasis>B</emphasis> if every member of <emphasis>B</emphasis> is also a member of <emphasis>A</emphasis> and <emphasis>A</emphasis> contains at least one element that is <emphasis>not</emphasis> a member of <emphasis>B</emphasis>.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[let employees: Set = [\"Alicia\", \"Bethany\", \"Chris\", \"Diana\", \"Eric\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let attendees: Set = [\"Alicia\", \"Bethany\", \"Diana\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(employees.isStrictSuperset(of: attendees))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"true\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// A set is never a strict superset of itself:]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(employees.isStrictSuperset(of: employees))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"false\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
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+        key.fully_annotated_decl: "<decl.function.method.instance><syntaxtype.attribute.builtin><syntaxtype.attribute.name>@inlinable</syntaxtype.attribute.name></syntaxtype.attribute.builtin> <syntaxtype.keyword>func</syntaxtype.keyword> <decl.name>isStrictSuperset</decl.name>(<decl.var.parameter><decl.var.parameter.argument_label>of</decl.var.parameter.argument_label> <decl.var.parameter.name>other</decl.var.parameter.name>: <decl.var.parameter.type><ref.struct usr=\"c:@E@FooRuncingOptions\">FooRuncingOptions</ref.struct></decl.var.parameter.type></decl.var.parameter>) -&gt; <decl.function.returntype><ref.struct usr=\"s:Sb\">Bool</ref.struct></decl.function.returntype></decl.function.method.instance>",
+        key.entities: [
+          {
+            key.kind: source.lang.swift.decl.var.local,
+            key.keyword: "of",
+            key.name: "other",
+            key.offset: 3392,
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+          }
+        ]
+      },
+      {
+        key.kind: source.lang.swift.decl.function.method.instance,
+        key.name: "isStrictSubset(of:)",
+        key.usr: "s:s10SetAlgebraPsE14isStrictSubset2ofSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions",
+        key.original_usr: "s:s10SetAlgebraPsE14isStrictSubset2ofSbx_tF",
+        key.doc.full_as_xml: "<Function><Name>isStrictSubset(of:)</Name><USR>s:s10SetAlgebraPsE14isStrictSubset2ofSbx_tF::SYNTHESIZED::c:@E@FooRuncingOptions</USR><Declaration>@inlinable func isStrictSubset(of other: FooRuncingOptions) -&gt; Bool</Declaration><CommentParts><Abstract><Para>Returns a Boolean value that indicates whether this set is a strict subset of the given set.</Para></Abstract><Parameters><Parameter><Name>other</Name><Direction isExplicit=\"0\">in</Direction><Discussion><Para>A set of the same type as the current set.</Para></Discussion></Parameter></Parameters><ResultDiscussion><Para><codeVoice>true</codeVoice> if the set is a strict subset of <codeVoice>other</codeVoice>; otherwise, <codeVoice>false</codeVoice>.</Para></ResultDiscussion><Discussion><Para>Set <emphasis>A</emphasis> is a strict subset of another set <emphasis>B</emphasis> if every member of <emphasis>A</emphasis> is also a member of <emphasis>B</emphasis> and <emphasis>B</emphasis> contains at least one element that is not a member of <emphasis>A</emphasis>.</Para><CodeListing language=\"swift\"><zCodeLineNumbered><![CDATA[let employees: Set = [\"Alicia\", \"Bethany\", \"Chris\", \"Diana\", \"Eric\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[let attendees: Set = [\"Alicia\", \"Bethany\", \"Diana\"]]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(attendees.isStrictSubset(of: employees))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"true\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// A set is never a strict subset of itself:]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[print(attendees.isStrictSubset(of: attendees))]]></zCodeLineNumbered><zCodeLineNumbered><![CDATA[// Prints \"false\"]]></zCodeLineNumbered><zCodeLineNumbered></zCodeLineNumbered></CodeListing></Discussion></CommentParts></Function>",
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           }
         ]