Raw identify resolv failed

[A4-Tacks]

peg::parser!(grammar parser() for str {
    pub rule r#break() =
});

error: proc macro panicked
 --> src/parser.rs:1:1
  |
1 | / peg::parser!(grammar parser() for str {
2 | |     pub rule r#break() =
3 | | });
  | |__^
  |
  = help: message: `"__parse_r#break"` is not a valid identifier