Merge pull request swiftlang#35335 from DougGregor/actor-isolation-selector

[Concurrency] Don't perform actor isolation checking within #selector.

Author: DougGregor

lib/Sema/TypeCheckConcurrency.cpp

@@ -834,6 +834,13 @@ namespace {
         }
       }
 
+      // The children of #selector expressions are not evaluation, so we do not
+      // need to do isolation checking there. This is convenient because such
+      // expressions tend to violate restrictions on the use of instance
+      // methods.
+      if (isa<ObjCSelectorExpr>(expr))
+        return { false, expr };
+
       return { true, expr };
     }
 

test/Concurrency/actor_isolation_objc.swift

@@ -0,0 +1,33 @@
+// RUN: %target-typecheck-verify-swift -enable-experimental-concurrency
+// REQUIRES: concurrency
+// REQUIRES: objc_interop
+
+import Foundation
+
+func g(_ selector: Selector) -> Int { }
+
+actor class A {
+  func selectors() {
+    _ = #selector(type(of: self).f) // expected-error{{argument of '#selector' refers to instance method 'f()' that is not exposed to Objective-C}}
+    _ = #selector(type(of: self).g) // expected-error{{argument of '#selector' refers to instance method 'g()' that is not exposed to Objective-C}}
+    _ = #selector(type(of: self).h)
+  }
+
+  func keypaths() {
+    _ = #keyPath(A.x) // expected-error{{argument of '#keyPath' refers to non-'@objc' property 'x'}}
+    _ = #keyPath(A.y) // expected-error{{argument of '#keyPath' refers to non-'@objc' property 'y'}}
+    _ = #keyPath(A.z)
+  }
+
+  var x: Int = 0 // expected-note{{add '@objc' to expose this property to Objective-C}}
+  @objc var y: Int = 0 // expected-note{{add '@objc' to expose this property to Objective-C}}
+  // expected-error@-1{{actor-isolated property 'y' cannot be @objc}}
+  @objc @actorIndependent(unsafe) var z: Int = 0
+
+  func f() { } // expected-note{{add '@objc' to expose this instance method to Objective-C}}
+  func g() { } // expected-note{{add '@objc' to expose this instance method to Objective-C}}
+  @objc func h() async { }
+}
+
+
+