Support Ruby 3.5 for Prism::Translation::Parser
#3346
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Follow up ruby#3336. Development for Ruby 3.5 has begun on the master branch: ruby/ruby@2f064b3
kddnewton
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Dec 26, 2024
koic
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Mar 21, 2025
## Summary `Prism::Translation::Parser35` has been started development for Ruby 3.5 (edge Ruby): ruby/prism#3346 At present, there is no timeline for Ruby 3.5 support in the Parser gem: whitequark/parser#1046 Given this, support for Ruby 3.5 will first be introduced in `Prism::Translation::Parser`. This can also serve as a trigger to facilitate user migration from `ParserEngine: parser_whitequark` to `ParserEngine: parser_prism`. As for Ruby 3.4, `Prism::Translation::Parser` is working on supporting the `it` syntax in ruby/prism#3481, but the Parser gem has not yet supported for it. However, whether to deprecate Ruby 3.4 in the Parser gem will be considered separately from this PR. Since Ruby 3.5 is a development version with minimal impact on users, while Ruby 3.4 is a stable release, they will be evaluated separately. ## Additional Information First, the default `parser_engine` for Ruby 3.5 is set to `parser_prism`. This default aligns with the current state of support, as the Parser gem is not expected to support Ruby 3.5. The more challenging decision is how to handle the default for Ruby 3.4. Ruby 3.4 will likely serve as a transition period between the Parser gem and Prism. While it is possible to set the default `parser_engine` to `parser_prism` for Ruby 3.4 as well, considering the potential unexpected incompatibilities in `Prism::Translation::Parser`, the default remains `parser_whitequark`. In any case, the primary use case is RuboCop, and what matters most is which value RuboCop chooses to pass. In other words, the key decision lies with RuboCop.
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Follow up #3336.
Development for Ruby 3.5 has begun on the master branch: ruby/ruby@2f064b3