-AT_CHECK([bison -o input.c input.y], 1, [],
-[input.y: warning: 1 reduce/reduce conflict
-input.y: expected 0 reduce/reduce conflicts
+AT_CHECK([bison -o input.c input.y], 0, [],
+[input.y: conflicts: 1 reduce/reduce
+input.y: warning: expected 0 reduce/reduce conflicts