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Update parse-error-recovery.md #183

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12 changes: 9 additions & 3 deletions content/ideas/parse-error-recovery.md
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Expand Up @@ -26,13 +26,19 @@ parse error messages in GHC.
There are a couple of stretch goals:

* `happy` could further be improved to pass a closure of its
parse state to reduction actions, so as to enable incremental parsing.
parse state to reduction actions, so as to enable incremental parsing
in GHC's parser.
* Improve `happy` so that it provides a convenient and encapsulated way to
introspect the LALR item stack, for example to identify bracketing
productions such as `'(' expr . ')'` in order to report mismatched brackets.
productions such as `'(' expr . ')'` in GHC's parser in order to report mismatched brackets.
There is a [hacky GHC Merge Request](https://gitlab.haskell.org/ghc/ghc/-/merge_requests/4711)
that tries to achieve as much without buy in from happy.
* Improve `happy`s code base, which by now is over 25 years old.
* Improve `happy`s code base, which by now is over 25 years old.
For example, recently `happy` has been modularised, thus split
into multiple independently usable packages (for modelling grammars,
building LALR tables, producing Haskell code from LALR tables, etc.),
but unfortunately the individual packages
[lack documentation and examples](https://github.com/haskell/happy/issues/238#issuecomment-1925804930).

**Potential Mentors**:
Sebastian Graf
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