PR20090: Add (passing) test from this bug; it's been fixed for a while.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@291319 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 0 deletions

diff --git a/test/SemaTemplate/constexpr-instantiate.cpp b/test/SemaTemplate/constexpr-instantiate.cpp
index b8cfbe1e0e..dfb8a07d3b 100644
--- a/test/SemaTemplate/constexpr-instantiate.cpp
+++ b/test/SemaTemplate/constexpr-instantiate.cpp
@@ -252,3 +252,10 @@ namespace NoInstantiationWhenSelectingOverload {
   void h() { (void)sizeof(char{f(0)}); }
   void i() { (void)sizeof(char{f("oops")}); } // expected-note {{instantiation of}}
 }
+
+namespace PR20090 {
+  template <typename T> constexpr T fact(T n) {
+    return n == 0 ? 1 : [=] { return n * fact(n - 1); }();
+  }
+  static_assert(fact(0) == 1, "");
+}