Merge pull request swiftlang#63500 from tbkka/tbkka-rdar90269352-unwrap-AnyHashable

Add a test to verify that AnyHashable gets eagerly unwrapped

Author: swift-ci

test/Casting/Casts.swift

@@ -1051,4 +1051,17 @@ CastsTests.test("Do not overuse __SwiftValue (non-ObjC)") {
   expectNotNil(runtimeCast(b, to: Foo.self))
 }
 
+CastsTests.test("Don't put AnyHashable inside AnyObject") {
+  class C: Hashable {
+    func hash(into hasher: inout Hasher) {}
+    static func ==(lhs: C, rhs: C) -> Bool { true }
+  }
+  let a = C()
+  let b = AnyHashable(a)
+  let c = a as! AnyObject
+  expectTrue(a === c)
+  let d = c as! C
+  expectTrue(a === d)
+}
+
 runAllTests()