Remove Expr sugar decorating the CXXUuidofExpr node.

Summary: Sugar, like ConstantExpr, causes an infinite expansion of the template object.

Reviewers: rsmith, aaron.ballman

Reviewed By: aaron.ballman

Subscribers: riccibruno, aaron.ballman, cfe-commits, tzik, rnk

Differential Revision: https://reviews.llvm.org/D57114

llvm-svn: 352307

1 files changed, 16 insertions, 0 deletions

diff --git a/clang/test/SemaCXX/PR40395.cpp b/clang/test/SemaCXX/PR40395.cpp
new file mode 100644
index 00000000000..469c86d5620
--- /dev/null
+++ b/clang/test/SemaCXX/PR40395.cpp
@@ -0,0 +1,16 @@
+// RUN: %clang_cc1 -std=c++17 -fms-extensions -triple=x86_64-pc-win32 -verify %s
+// expected-no-diagnostics
+
+// PR40395 - ConstantExpr shouldn't cause the template object to infinitely
+// expand.
+struct _GUID {};
+struct __declspec(uuid("{AAAAAAAA-AAAA-AAAA-AAAA-AAAAAAAAAAAA}")) B {};
+
+template <const _GUID* piid>
+struct A {
+  virtual void baz() { A<piid>(); }
+};
+
+void f() {
+  A<&__uuidof(B)>();
+}