tweak error message

.github/workflows/rust.yml

@@ -39,7 +39,7 @@ jobs:
       run: |
         exit_code=0
         while IFS= read -r line; do
-          printf "%s but expected failure because it's ignored"'\n' "$line"
+          printf "::error title=Ignored test is passing::%s but expected failure because it's ignored"'\n' "$line"
           exit_code=1
         done < <(cargo test -- --ignored --color never | grep '\.\.\. ok$' || true)
         exit "$exit_code"