1 files changed, 20 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/cpp0x/constexpr-diag1.C b/gcc/testsuite/g++.dg/cpp0x/constexpr-diag1.C
new file mode 100644
index 000000000..183d3f768
--- /dev/null
+++ b/gcc/testsuite/g++.dg/cpp0x/constexpr-diag1.C
@@ -0,0 +1,20 @@
+// Test that we explain why a template instantiation isn't constexpr
+// { dg-options -std=c++0x }
+
+template <class T>
+struct A
+{
+  T t;
+  constexpr int f() { return 42; } // { dg-error "enclosing class" }
+};
+
+struct B { B(); operator int(); };
+
+constexpr A<int> ai = { 42 };
+constexpr int i = ai.f();
+
+constexpr int b = A<B>().f();	// { dg-error "not a constexpr function" }
+
+template <class T>
+constexpr int f (T t) { return 42; } // { dg-error "parameter" }
+constexpr int x = f(B());	     // { dg-error "constexpr function" }