Allow global actors on stored properties

Author: DougGregor

include/swift/AST/DiagnosticsSema.def

@@ -4446,8 +4446,6 @@ ERROR(global_actor_on_actor_class,none,
       "actor class %0 cannot have a global actor", (Identifier))
 ERROR(global_actor_on_local_variable,none,
       "local variable %0 cannot have a global actor", (DeclName))
-ERROR(global_actor_on_struct_property,none,
-      "stored property %0 of a struct cannot have a global actor", (DeclName))
 ERROR(global_actor_non_unsafe_init,none,
       "global actor attribute %0 argument can only be '(unsafe)'", (Type))
 

lib/Sema/TypeCheckConcurrency.cpp

@@ -458,15 +458,6 @@ GlobalActorAttributeRequest::evaluate(
             .highlight(globalActorAttr->getRangeWithAt());
         return None;
       }
-
-      // Global actors don't make sense on a stored property of a struct.
-      if (var->hasStorage() && var->getDeclContext()->getSelfStructDecl() &&
-          var->isInstanceMember()) {
-        var->diagnose(diag::global_actor_on_struct_property, var->getName())
-          .highlight(globalActorAttr->getRangeWithAt());
-        return None;
-      }
-
     }
   } else if (isa<ExtensionDecl>(decl)) {
     // Extensions are okay.

test/attr/global_actor.swift

@@ -65,7 +65,7 @@ struct OtherGlobalActor {
 }
 
 @GA1 struct X {
-  @GA1 var member: Int // expected-error{{stored property 'member' of a struct cannot have a global actor}}
+  @GA1 var member: Int
 }
 
 struct Y {