Merge pull request swiftlang#31081 from slavapestov/fix-property-wrapper-init-diagnostics

Fix property wrapper init diagnostics

Author: slavapestov

lib/Sema/TypeCheckPropertyWrapper.cpp

@@ -101,7 +101,8 @@ static VarDecl *findValueProperty(ASTContext &ctx, NominalTypeDecl *nominal,
 /// type.
 static ConstructorDecl *
 findSuitableWrapperInit(ASTContext &ctx, NominalTypeDecl *nominal,
-                        VarDecl *valueVar, PropertyWrapperInitKind initKind) {
+                        VarDecl *valueVar, PropertyWrapperInitKind initKind,
+                        const SmallVectorImpl<ValueDecl *> &decls) {
   enum class NonViableReason {
     Failable,
     ParameterTypeMismatch,
@@ -111,7 +112,6 @@ findSuitableWrapperInit(ASTContext &ctx, NominalTypeDecl *nominal,
   SmallVector<std::tuple<ConstructorDecl *, NonViableReason, Type>, 2>
       nonviable;
   SmallVector<ConstructorDecl *, 2> viableInitializers;
-  SmallVector<ValueDecl *, 2> decls;
 
   Identifier argumentLabel;
   switch (initKind) {
@@ -125,8 +125,6 @@ findSuitableWrapperInit(ASTContext &ctx, NominalTypeDecl *nominal,
     break;
   }
 
-  nominal->lookupQualified(nominal, DeclNameRef::createConstructor(),
-                           NL_QualifiedDefault, decls);
   for (const auto &decl : decls) {
     auto init = dyn_cast<ConstructorDecl>(decl);
     if (!init || init->getDeclContext() != nominal || init->isGeneric())
@@ -156,6 +154,14 @@ findSuitableWrapperInit(ASTContext &ctx, NominalTypeDecl *nominal,
     if (hasExtraneousParam)
       continue;
 
+    if (initKind != PropertyWrapperInitKind::Default) {
+      if (!argumentParam)
+        continue;
+
+      if (argumentParam->isInOut() || argumentParam->isVariadic())
+        continue;
+    }
+
     // Failable initializers cannot be used.
     if (init->isFailable()) {
       nonviable.push_back(
@@ -172,12 +178,6 @@ findSuitableWrapperInit(ASTContext &ctx, NominalTypeDecl *nominal,
 
     // Additional checks for initial-value and wrapped-value initializers
     if (initKind != PropertyWrapperInitKind::Default) {
-      if (!argumentParam)
-        continue;
-
-      if (argumentParam->isInOut() || argumentParam->isVariadic())
-        continue;
-
       auto paramType = argumentParam->getInterfaceType();
       if (paramType->is<ErrorType>())
         continue;
@@ -345,18 +345,22 @@ PropertyWrapperTypeInfoRequest::evaluate(
   if (!valueVar)
     return PropertyWrapperTypeInfo();
 
-  // FIXME: Remove this one
-  (void)valueVar->getInterfaceType();
-  
+  TypeChecker::addImplicitConstructors(nominal);
+
+  SmallVector<ValueDecl *, 2> decls;
+  nominal->lookupQualified(nominal, DeclNameRef::createConstructor(),
+                           NL_QualifiedDefault, decls);
+
   PropertyWrapperTypeInfo result;
   result.valueVar = valueVar;
   if (auto init = findSuitableWrapperInit(ctx, nominal, valueVar,
-                              PropertyWrapperInitKind::WrappedValue)) {
+                              PropertyWrapperInitKind::WrappedValue, decls)) {
     result.wrappedValueInit = PropertyWrapperTypeInfo::HasWrappedValueInit;
     result.isWrappedValueInitUsingEscapingAutoClosure =
       isEscapingAutoclosureArgument(init, ctx.Id_wrappedValue);
   } else if (auto init = findSuitableWrapperInit(
-               ctx, nominal, valueVar, PropertyWrapperInitKind::InitialValue)) {
+               ctx, nominal, valueVar, PropertyWrapperInitKind::InitialValue,
+               decls)) {
     result.wrappedValueInit = PropertyWrapperTypeInfo::HasInitialValueInit;
     result.isWrappedValueInitUsingEscapingAutoClosure =
       isEscapingAutoclosureArgument(init, ctx.Id_initialValue);
@@ -376,7 +380,7 @@ PropertyWrapperTypeInfoRequest::evaluate(
   }
 
   if (findSuitableWrapperInit(ctx, nominal, /*valueVar=*/nullptr,
-                              PropertyWrapperInitKind::Default)) {
+                              PropertyWrapperInitKind::Default, decls)) {
     result.defaultInit = PropertyWrapperTypeInfo::HasDefaultValueInit;
   }
 

test/SILGen/Inputs/property_wrappers_multifile_other.swift

@@ -7,6 +7,8 @@ public class MyClass {
 
 @propertyWrapper
 public struct PropertyWrapper {
+  public init() { }
+
   public var projectedValue: PropertyWrapper {
     get {
       return self

test/SILGen/property_wrappers_final.swift

@@ -17,6 +17,8 @@ public class MyClass {
 
 @propertyWrapper
 public struct PropertyWrapper {
+  public init() { }
+
   public var projectedValue: PropertyWrapper {
     get {
       return self

test/decl/var/property_wrappers.swift

@@ -1934,5 +1934,10 @@ struct TestDefaultableIntWrapper {
   }
 }
 
-
-
+@propertyWrapper
+public struct NonVisibleImplicitInit {
+// expected-error@-1 {{internal initializer 'init()' cannot have more restrictive access than its enclosing property wrapper type 'NonVisibleImplicitInit' (which is public)}}
+  public var wrappedValue: Bool {
+    return false
+  }
+}