"<gxp:param name='foo' type='String' />");
FileRef implementation = createFile("template2",
"<gxp:implements interface='template1' />",
"<gxp:param name='foo' type='String' />");
compileFiles(refTemplate, implementation);
assertAlert(new ImplementableNotFoundError(pos(2,1), TemplateName.create(null, "template1")));
assertNoUnexpectedAlerts();
}