re PR c++/89873 (internal compiler error: unexpected expression of kind implicit_conv_expr)

	PR c++/89873
	* g++.dg/cpp1y/noexcept1.C: New test.

From-SVN: r272507

gcc/testsuite/ChangeLog

+2019-06-20  Marek Polacek  <polacek@redhat.com>
+
+	PR c++/89873
+	* g++.dg/cpp1y/noexcept1.C: New test.
+
 2019-06-20  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/90937

gcc/testsuite/g++.dg/cpp1y/noexcept1.C

+// 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>();