Merge pull request #37407 from hborla/wrapped-parameter-serialization

[Property Wrappers] Fix a crash in merge-modules with wrapped parameters.

Author: hborla

lib/Sema/TypeCheckPropertyWrapper.cpp

@@ -622,6 +622,11 @@ PropertyWrapperBackingPropertyTypeRequest::evaluate(
   if (!type)
     return Type();
 
+  // If the declaration came from a module file, there's no need to
+  // compute the auxiliary variables.
+  if (!var->getDeclContext()->getParentSourceFile())
+    return type;
+
   // Set the interface type of each synthesized declaration.
   auto auxiliaryVars = var->getPropertyWrapperAuxiliaryVariables();
   auxiliaryVars.backingVar->setInterfaceType(type);

validation-test/Serialization/rdar77804605.swift

@@ -0,0 +1,19 @@
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend -emit-module-path %t/WrappedParameter.swiftmodule -emit-module-source-info-path %t/WrappedParameter.swiftsourceinfo -module-name WrappedParameter -enable-testing %s
+// RUN: %target-swift-frontend -merge-modules -emit-module %t/WrappedParameter.swiftmodule -module-name WrappedParameter -o %t/WrappedParameter.swiftmodule
+
+// Make sure wrapped parameters don't crash in merge-modules when
+// they were compiled with -emit-module-source-info and -enable-testing.
+
+@propertyWrapper
+struct ProjectionWrapper<Value> {
+  var wrappedValue: Value
+
+  var projectedValue: Self { self }
+
+  public init(projectedValue: Self) {
+    self = projectedValue
+  }
+}
+
+func test(@ProjectionWrapper value: Int) {}