message: Use raw identifier for struct test module
diff: @@ -21,7 +21,7 @@ test!(duplicate_definitions, "duplicate_definitions.ddl");
  test!(unexpected_token, "unexpected_token.ddl");
  test!(unexpected_character, "unexpected_character.ddl");
  -mod struct_ {
  +mod r#struct {
  // ok
  test!(empty, "struct/empty.ddl");
  test!(empty_doc, "struct/empty_doc.ddl");
  