Allow subtyping conversion to add @Sendable in preconcurrency code.

DougGregor · DougGregor · commit d8d648de405b · 2022-09-16T10:11:56.000-07:00
Fixes rdar://99518344.
diff --git a/lib/Sema/CSFix.cpp b/lib/Sema/CSFix.cpp
@@ -257,6 +257,7 @@ getConcurrencyFixBehavior(
   switch (constraintKind) {
   case ConstraintKind::Conversion:
   case ConstraintKind::ArgumentConversion:
+  case ConstraintKind::Subtype:
     break;
 
   default:
