Add a test ensuring that we don't regress this

diff --git a/src/test/ui/loud_ui.rs b/src/test/ui/loud_ui.rs
new file mode 100644 (file)
index 0000000..7f98d81
--- /dev/null
+++ b/src/test/ui/loud_ui.rs
@@ -0,0 +1,6 @@
+// should-fail
+
+// this test ensures that when we forget to use
+// any `//~ ERROR` comments whatsoever, that the test doesn't succeed
+
+fn main() {}
\ No newline at end of file