ci: add unparsable check in fixtures

.github/workflows/pr.yaml

@@ -177,3 +177,10 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - run: make python_install
       - run: make ci
+  check-no-unparsable:
+    name: Check no unparsable files
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: chmod +x ./.hacking/scripts/check_for_unparsable.sh
+      - run: ./.hacking/scripts/check_for_unparsable.sh

.hacking/scripts/check_for_unparsable.sh

@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+#
+# Usage:
+#   ./check_pattern.sh "your_grep_pattern" [file1 file2 file3 ...]
+#
+# Examples:
+#   # Use the default directory if no files are provided
+#   ./check_pattern.sh "unparsable:"
+#
+#   # Provide explicit files or directories
+#   ./check_pattern.sh "error|fail" logs/*.log
+#
+# Exit codes:
+#   0 - Pattern NOT found in any file
+#   1 - Pattern found in at least one file
+
+pattern="unparsable:"
+shift  # Shift so $@ now contains only filenames (if any)
+
+# If no files are specified, default to looking in crates/lib-dialects/test/fixtures/dialects/***/*.yml
+if [[ $# -eq 0 ]]; then
+  set -- crates/lib-dialects/test/fixtures/dialects/**\/*.yml
+fi
+
+found=0
+files_found=()
+
+for filename in "$@"; do
+  # Use extended regular expressions (-E). -q ensures grep is quiet (no output).
+  if grep -qE "$pattern" "$filename" 2>/dev/null; then
+    found=1
+    files_found+=("$filename")
+  fi
+done
+
+# If found in any file, list them
+if [[ $found -eq 1 ]]; then
+  echo "Pattern '$pattern' found in:"
+  for file in "${files_found[@]}"; do
+    echo "  $file"
+  done
+fi
+
+# Exit with 1 if found, otherwise 0
+exit $found