c++: Add new test [PR79493]

A nice side effect of r12-1822 was improving the diagnostic
we emit for the following test.

	PR c++/79493

gcc/testsuite/ChangeLog:

	* g++.dg/diagnostic/undeclared1.C: New test.

diff --git a/gcc/testsuite/g++.dg/diagnostic/undeclared1.C b/gcc/testsuite/g++.dg/diagnostic/undeclared1.C
new file mode 100644 (file)
index 0000000..98c1ecb
--- /dev/null
+++ b/gcc/testsuite/g++.dg/diagnostic/undeclared1.C
@@ -0,0 +1,7 @@
+// PR c++/79493
+
+namespace A { }
+struct B {
+  void f(A::nonexistent param); // { dg-error ".A::nonexistent. has not been declared" }
+  void* g(A::nonexistent param); // { dg-error ".A::nonexistent. has not been declared" }
+};