Error recovery/resilience

Currently, all of the parse functions return Result<ast, ParseError>. This means that if the file has a syntax error, we get the error and nothing else. However, there are some use cases in which having access to parts which did parse successfully would be beneficial:

• Language servers usually want to keep functioning when the file is temporarily broken during editing.
• Linters might want to skip over broken parts and continue reporting lints, or maybe up to the syntax error.

On the other hand, interpreters usually don't have too much use for this AFAIK.

lalrpop seems to have some support for error recovery: https://lalrpop.github.io/lalrpop/tutorial/008_error_recovery.html
Alex Kladov has written about error recovery, most recently here: https://matklad.github.io/2023/05/21/resilient-ll-parsing-tutorial.html

Is RustPython/Parser interested in error recovery or is it out of scope?

Comece lendo as funções parse do parser e como elas retornam atualmente Result<ast, ParseError>. Revise o material vinculado sobre LALRPOP e parsing LL resiliente para comparar as abordagens de recuperação. Considera-se concluído quando o projeto tiver chegado a uma decisão acordada sobre se a recuperação de erros faz parte do escopo e, caso faça, houver um design concreto para preservar as partes analisadas com sucesso.