[Concurrency] Note that 'actor' is a decl modifier, not an attribute.

DougGregor · DougGregor · commit 1e040ac3235c · 2020-09-30T00:02:17.000-07:00
diff --git a/include/swift/AST/Attr.def b/include/swift/AST/Attr.def
@@ -567,7 +567,7 @@ SIMPLE_DECL_ATTR(asyncHandler, AsyncHandler,
   101)
 
 CONTEXTUAL_SIMPLE_DECL_ATTR(actor, Actor,
-  OnClass | ConcurrencyOnly |
+  DeclModifier | OnClass | ConcurrencyOnly |
   ABIBreakingToAdd | ABIBreakingToRemove |
   APIBreakingToAdd | APIBreakingToRemove,
   102)
diff --git a/test/decl/class/actor/noconcurrency.swift b/test/decl/class/actor/noconcurrency.swift
@@ -1,4 +1,4 @@
 // RUN: %target-typecheck-verify-swift
 
-actor class C { } // expected-error{{'actor' attribute is only valid when experimental concurrency is enabled}}
+actor class C { } // expected-error{{'actor' modifier is only valid when experimental concurrency is enabled}}
 

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`	`1`	`// RUN: %target-typecheck-verify-swift`
`2`	`2`
`3`		`-actor class C { } // expected-error{{'actor' attribute is only valid when experimental concurrency is enabled}}`
	`3`	`+actor class C { } // expected-error{{'actor' modifier is only valid when experimental concurrency is enabled}}`
`4`	`4`