Merge pull request swiftlang#76293 from kavon/ncgenerics-opaque-dependent-conformance-mangling

ASTMangler: skip mangling Copyable dependents

Author: kavon

lib/AST/ASTMangler.cpp

@@ -4215,6 +4215,12 @@ void ASTMangler::appendAnyProtocolConformance(
       conformance.getRequirement()->isMarkerProtocol())
     return;
 
+  // While all invertible protocols are marker protocols, do not mangle them for
+  // compatability reasons. See equivalent hack in `conformanceRequirementIndex`
+  // where only invertible protocols are unconditionally skipped.
+  if (conformance.getRequirement()->getInvertibleProtocolKind())
+    return;
+
   if (conformingType->isTypeParameter()) {
     assert(genericSig && "Need a generic signature to resolve conformance");
     auto path = genericSig->getConformancePath(conformingType,

test/Interpreter/moveonly_generics_opaque.swift

@@ -0,0 +1,29 @@
+// RUN: %target-run-simple-swift(-Xfrontend -disable-availability-checking) | %FileCheck %s
+// RUN: %target-run-simple-swift(-Xfrontend -disable-availability-checking -O) | %FileCheck %s
+
+// REQUIRES: executable_test
+
+// UNSUPPORTED: use_os_stdlib
+// UNSUPPORTED: back_deployment_runtime
+
+protocol Marked {
+  func announce()
+}
+extension Marked {
+  func announce() { print("\(Self.self) is Marked") }
+}
+
+struct ConcreteWrapper<Wrapped> {}
+extension ConcreteWrapper: Marked where Wrapped: Marked {}
+
+struct Hello<T: ~Copyable> {}
+extension Hello: Marked {}
+
+func makeWrapper<P>(wrapping _: P.Type) -> some Marked {
+    ConcreteWrapper<Hello<P>>()
+}
+
+do {
+  let markedVal = makeWrapper(wrapping: String.self)
+  markedVal.announce() // CHECK: ConcreteWrapper<Hello<String>> is Marked
+}