Make UI tests annotations mandatory

Author: GuillaumeGomez

tests/compile-test.rs

@@ -122,7 +122,7 @@ fn base_config(test_dir: &str) -> (Config, Args) {
         out_dir: target_dir.join("ui_test"),
         ..Config::rustc(Path::new("tests").join(test_dir))
     };
-    config.comment_defaults.base().mode = Some(Spanned::dummy(Mode::Yolo)).into();
+    config.comment_defaults.base().mode = Some(Spanned::dummy(Mode::Fail { require_patterns: true })).into();
     config
         .comment_defaults
         .base()