--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/cpp1y/noexcept1.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,13 @@
+// PR c++/89873
+// { dg-do compile { target c++14 } }
+
+template <int> bool b;
+
+template <typename> 
+struct C {
+  template <typename> friend int foo() noexcept(b<1>); // { dg-error "not usable in a constant expression|different exception specifier" }
+};
+
+template <typename> int foo() noexcept(b<1>);
+
+auto a = C<int>();