Merge pull request swiftlang#77649 from hamishknight/tweak-complete-subscript-assert

Author: hamishknight

lib/IDE/ArgumentCompletion.cpp

@@ -374,12 +374,15 @@ void ArgumentTypeCheckCompletionCallback::collectResults(
       }
       if (Result.FuncTy) {
         if (auto FuncTy = Result.FuncTy) {
+          // Only show call pattern completions if the function isn't
+          // overridden.
           if (ShadowedDecls.count(Result.FuncD) == 0) {
-            // Don't show call pattern completions if the function is
-            // overridden.
             if (Result.IsSubscript) {
-              assert(SemanticContext != SemanticContextKind::None);
+              // The subscript decl may not be preset for e.g the implicit
+              // `keyPath:` subscript. Such a subscript is allowed on any
+              // non-nominal type, so the semantic context may be none.
               auto *SD = dyn_cast_or_null<SubscriptDecl>(Result.FuncD);
+              assert(!SD || SemanticContext != SemanticContextKind::None);
               Lookup.addSubscriptCallPattern(FuncTy, SD, SemanticContext);
             } else {
               auto *FD = dyn_cast_or_null<AbstractFunctionDecl>(Result.FuncD);

test/IDE/complete_subscript.swift

@@ -1,23 +1,4 @@
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=METATYPE_UNRESOLVED | %FileCheck %s -check-prefix=METATYPE_UNRESOLVED
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=METATYPE_UNRESOLVED_BRACKET | %FileCheck %s -check-prefix=METATYPE_UNRESOLVED_BRACKET
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=METATYPE_INT | %FileCheck %s -check-prefix=METATYPE_INT
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=METATYPE_INT_BRACKET | %FileCheck %s -check-prefix=METATYPE_INT_BRACKET
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=INSTANCE_INT | %FileCheck %s -check-prefix=INSTANCE_INT
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=INSTANCE_INT_BRACKET | %FileCheck %s -check-prefix=INSTANCE_INT_BRACKET
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=METATYPE_ARCHETYPE | %FileCheck %s -check-prefix=METATYPE_ARCHETYPE
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=METATYPE_ARCHETYPE_BRACKET | %FileCheck %s -check-prefix=METATYPE_ARCHETYPE_BRACKET
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=INSTANCE_ARCHETYPE | %FileCheck %s -check-prefix=INSTANCE_ARCHETYPE
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=INSTANCE_ARCHETYPE_BRACKET | %FileCheck %s -check-prefix=INSTANCE_ARCHETYPE_BRACKET
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=METATYPE_LABEL | %FileCheck %s -check-prefix=METATYPE_LABEL
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=INSTANCE_LABEL | %FileCheck %s -check-prefix=INSTANCE_LABEL
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=SELF_IN_INSTANCEMETHOD | %FileCheck %s -check-prefix=SELF_IN_INSTANCEMETHOD
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=SUPER_IN_INSTANCEMETHOD | %FileCheck %s -check-prefix=SUPER_IN_INSTANCEMETHOD
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=SELF_IN_STATICMETHOD | %FileCheck %s -check-prefix=SELF_IN_STATICMETHOD
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=SUPER_IN_STATICMETHOD | %FileCheck %s -check-prefix=SUPER_IN_STATICMETHOD
-
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=LABELED_SUBSCRIPT | %FileCheck %s -check-prefix=LABELED_SUBSCRIPT
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=TUPLE | %FileCheck %s -check-prefix=TUPLE
-// RUN: %target-swift-ide-test -code-completion -source-filename %s -code-completion-token=SETTABLE_SUBSCRIPT | %FileCheck %s -check-prefix=SETTABLE_SUBSCRIPT
+// RUN: %batch-code-completion
 
 struct MyStruct<T> {
   static subscript(x: Int, static defValue: T) -> MyStruct<T> {
@@ -152,3 +133,10 @@ func testSettableSub(x: inout HasSettableSub) {
 // SETTABLE_SUBSCRIPT-DAG: Pattern/CurrNominal/Flair[ArgLabels]: ['[']{#keyPath: KeyPath<HasSettableSub, Value>#}[']'][#Value#];
 // SETTABLE_SUBSCRIPT-DAG: Decl[Subscript]/CurrNominal/Flair[ArgLabels]: ['[']{#(a): String#}[']'][#@lvalue Int#];
 // SETTABLE_SUBSCRIPT-DAG: Decl[LocalVar]/Local/TypeRelation[Convertible]: local[#String#]; name=local
+
+// rdar://139333904 - Make sure we don't hit an assertion.
+func testFnKeyPathSubscript() {
+  // The keyPath: subscript is supported on all non-nominal types, including functions.
+  test1[#^FN_KEYPATH_SUBSCRIPT^#]
+  // FN_KEYPATH_SUBSCRIPT: Pattern/None/Flair[ArgLabels]: ['[']{#keyPath: KeyPath<() -> (), Value>#}[']'][#Value#]; name=keyPath:
+}