+AT_CHECK([bison input.y], [], [],
+[[input.y:4.6-15: warning: type clash on default action: <bar> != <>
+input.y:5.6-8: warning: type clash on default action: <bar> != <>
+input.y:6.5: warning: empty rule for typed nonterminal, and no action
+]])
+
+AT_CLEANUP
+
+
+## ---------------------- ##
+## Incompatible Aliases. ##
+## ---------------------- ##
+
+AT_SETUP([Incompatible Aliases])
+
+AT_DATA([input.y],
+[[%token foo "foo"
+
+%type <bar> foo
+%printer {bar} foo
+%destructor {bar} foo
+%left foo
+
+%type <baz> "foo"
+%printer {baz} "foo"
+%destructor {baz} "foo"
+%left "foo"
+
+%%
+exp: foo;
+]])
+