Add a basic highlighting test

.github/workflows/ci.yaml

@@ -43,3 +43,17 @@ jobs:
           fi
       - run: npm test
         # FIXME: also parse tests/*.just
+
+  just:
+    name: Verify Just can parse our test files
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: taiki-e/install-action@just
+      - shell: bash
+        run: |
+          find . -type f -iregex '.*[\./]just[^\./]*' | while read -r fname
+          do
+            echo checking "$fname"
+            just --list --justfile "$fname"
+          done

test/highlight/recipes.just

@@ -0,0 +1,18 @@
+#!/use/bin/env just
+# <- comment
+# ^^^^^^^^^^^^^^^^^ comment
+
+foo:
+# <- function
+#  ^ operator
+
+@bar:
+# <- operator
+# ^ function
+#   ^ operator
+
+baz: foo bar
+# <- function
+#  ^ operator
+#     ^ function
+#          ^ function