Merge pull request #21074 from slavapestov/autoclosure-regression-test

SILGen: Add regression test for rdar://problem/44657505

Author: slavapestov

test/SILGen/auto_closures.swift

@@ -1,5 +1,5 @@
 
-// RUN: %target-swift-emit-silgen -module-name auto_closures -enable-sil-ownership -parse-stdlib %s | %FileCheck %s
+// RUN: %target-swift-emit-silgen -module-name auto_closures -enable-sil-ownership -parse-stdlib -swift-version 5 %s | %FileCheck %s
 
 struct Bool {}
 var false_ = Bool()

test/SILGen/auto_closures_swift4.swift

@@ -0,0 +1,16 @@
+
+// RUN: %target-swift-emit-silgen -module-name auto_closures -enable-sil-ownership -parse-stdlib -swift-version 4 %s
+
+// Swift 4-style autoclosure forwarding should not crash - rdar://problem/44657505
+
+public struct Empty {}
+
+public func x(_: @autoclosure () -> Empty) {}
+
+public func y1(_ message: @autoclosure () -> Empty) {
+  x(message)
+}
+
+public func y2(_ message: @autoclosure @escaping () -> Empty) {
+  x(message)
+}