Change PEG.js to use Peggy grammar #7018
Merged
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Description
Continuation based on #7017 (comment)
According to a maintainer of Peggy (@hildjj), this grammar is backwards-compatible with PEG.js, and includes some new features. See peggyjs/peggy#544 (comment) and peggyjs/peggy#544 (comment).
I didn't replace the old grammar submodule since it seems to be a special case, providing syntaxes for multiple languages.
Checklist: