FileRef callee = createFile(
"callee", "<gxp:param name='s' type='String' regex='foo' />");
FileRef caller = createFile("caller", "<my:callee s='bar' />");
compileFiles(caller, callee);
assertAlert(new InvalidParameterFailedRegexError(
pos(2, 1), "callee", "s", "foo", "bar"));
assertNoUnexpectedAlerts();
}