[gsoc_spectest] added one more test in the area (added 1 test)

git-svn-id: http://svn.pugscode.org/pugs@21890 c213334d-75ef-0310-aa23-eaa082d1ae64

S06-advanced_subroutine_features/stub.t

@@ -1,12 +1,14 @@
 use v6;
 use Test;
 
-plan 9;
+plan 10;
 
 # L<S06/Stub declarations>
 
 lives_ok({sub thunder {...}}, 'sub foo {...} works');
 
+eval_dies_ok('sub foo;', 'old Perl 5 "sub foo;" syntax is dead');
+
 {
     sub lightning {...}
     # Maybe should be warns_ok