1 files changed, 25 insertions, 0 deletions
diff --git a/test/CodeGenCoroutines/microsoft-abi-operator-coawait.cpp b/test/CodeGenCoroutines/microsoft-abi-operator-coawait.cpp
new file mode 100644
index 000000000000..1921c06e5af0
--- /dev/null
+++ b/test/CodeGenCoroutines/microsoft-abi-operator-coawait.cpp
@@ -0,0 +1,25 @@
+// RUN: %clang_cc1 -triple x86_64-pc-windows-msvc18.0.0 -fcoroutines-ts -emit-llvm %s -o - -std=c++14 -disable-llvm-passes | FileCheck %s
+struct no_suspend {
+  bool await_ready() { return true; }
+  template <typename F> void await_suspend(F) {}
+  void await_resume() {}
+};
+
+struct A {
+  no_suspend operator co_await() { return {}; }
+};
+
+struct B {};
+
+no_suspend operator co_await(B const&) { return {}; }
+
+// CHECK-LABEL: f(
+extern "C" void f() {
+  A a;
+  B b;
+  // CHECK: call void @"\01??__LA@@QEAA?AUno_suspend@@XZ"(
+  a.operator co_await();
+  // CHECK-NEXT: call i8 @"\01??__L@YA?AUno_suspend@@AEBUB@@@Z"(
+  operator co_await(b);
+}
+