## Development Guide

- Run `make test` to test all.

## Update Pest original `grammar.pest`.

The `src/grammar.pest` file is a copy of the original
[grammar.pest](https://github.com/pest-parser/pest/blob/master/meta/src/grammar.pest) file from the Pest repository.

But it is a little bit different from the original file:

```diff
-COMMENT = _{ block_comment | line_comment }
+COMMENT = { block_comment | line_comment }
```

The `make update_grammar` command will update the `src/grammar.pest` from the original file and
apply the above change (by `src/grammar.patch` file).
