HACK: re-disable mangling round-trip checking

Author: kavon

lib/Frontend/CompilerInvocation.cpp

@@ -2641,6 +2641,9 @@ static bool ParseIRGenArgs(IRGenOptions &Opts, ArgList &Args,
   if (Args.hasArg(OPT_no_clang_module_breadcrumbs))
     Opts.DisableClangModuleSkeletonCUs = true;
 
+  if (SWIFT_ENABLE_EXPERIMENTAL_NONCOPYABLE_GENERICS)
+    Opts.DisableRoundTripDebugTypes = true; // temporary until we fix mangling!
+
   if (auto A = Args.getLastArg(OPT_enable_round_trip_debug_types,
                                OPT_disable_round_trip_debug_types)) {
     Opts.DisableRoundTripDebugTypes =

stdlib/cmake/modules/SwiftSource.cmake

@@ -610,6 +610,7 @@ function(_compile_swift_files
   if(SWIFT_ENABLE_EXPERIMENTAL_NONCOPYABLE_GENERICS)
     list(APPEND swift_flags "-enable-experimental-feature" "NoncopyableGenerics")
     list(APPEND swift_flags "-Xfrontend" "-enable-experimental-associated-type-inference")
+    list(APPEND swift_flags "-Xfrontend" "-disable-round-trip-debug-types") # NOTE: temporary until we fix mangling!
   endif()
 
   if (SWIFT_STDLIB_ENABLE_STRICT_CONCURRENCY_COMPLETE)