| // RUN: %target-run-simple-swift | %FileCheck %s |
| // REQUIRES: executable_test |
| // REQUIRES: objc_interop |
| |
| // rdar://problem/28022201 exposed an ABI mismatch bug between the C++ code |
| // in the runtime and standard library hook functions written in Swift, which |
| // led to dynamic cast operations on sets and dictionaries generating corrupt |
| // type metadata. Exercising this bug requires that the first instantiation of |
| // a specific dictionary type in the process be through a dynamic cast. We |
| // then bridge to ObjC, so that the resulting NSDictionary subclass is forced |
| // to recover the underlying Dictionary's generic environment from the |
| // corrupted class metadata instead of getting it passed in from the compiler. |
| |
| import Foundation |
| |
| let a: [String: Int] = ["foo": 1] |
| let b: Any = a |
| let c = b as? [String: Any] |
| |
| let d = (c as AnyObject) as! NSDictionary |
| |
| _ = d.object(forKey: "foo" as NSString) |
| |
| // CHECK: ok |
| print("ok") |
