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Earlopain Sep 10, 2026
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Expand Up @@ -6,6 +6,55 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) a

## [Unreleased]

Highlights of this release:
- Significantly improved parsing performance by up to 40%.

@Earlopain Earlopain Sep 10, 2026

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Tested on the generated node.rb

- The prism gem now ships precompiled platform-specific variants to rubygems.org.
- Significant changes to the exposed C API and language bindings.

### Breaking Changes
- Optional locations like `StringNode#closing_loc` in `'foo` that were empty for syntax-invalid code will now be `nil` instead.
- `MissingNode` has been replaced by `ErrorRecoveryNode`. `ErrorRecoveryNode` wraps unexpected nodes, so when walking syntax-invalid code you will now only need to handle this one specific node type.
- Require arguments for `Prism::Source.for`. The second and third positional parameters are no longer optional.
- `Prism.lex` now returns an array of tokens instead of an array of `[token, internal_parse_state]`. Previous access like `token[0]` or `token.first` to extract the actual token will continue to work.
- The following tokens are changed: `PARENTHESIS_LEFT` was split up into `PARENTHESIS_LEFT` and `PARENTHESIS_LEFT_GROUPING`. `BRACE_LEFT` was split up into `BRACE_LEFT`, `BRACE_LEFT_ARGUMENT`, and `BRACE_LEFT_HASH`. `BACKTICK` was split up into `BACKTICK` and `XSTRING_BACKTICK`. `NEWLINE` was split up into `NEWLINE` and `NEWLINE_TERMINATOR`.

### Added
- Support for parsing Ruby 4.1 syntax.
- `version: "nearest"` is now supported. It behaves similarly to `version: "current"` but will not raise when the version is unsupported, instead falling back to the nearest syntax version prism currently supports.
- `raise_error` was added as a valid option. Prism will raise a `SyntaxError` when given syntax-invalid code. When `true` is given, prism decides the formatting (`tty?`, `NO_COLOR`, etc.). If you need a specific style, `:plain`, `:style`, and `:color` are also supported values.
- Added `Prism::ParseResult#continuable` to check if the parsed source can become valid by appending more code.
- `Prism.find` takes a `Method`, `UnboundMethod`, `Proc`, or `Thread::Backtrace::Location` and returns the associated prism AST node.
- `ForwardingSuperNode` now has `keyword_loc`.
- Allow pattern matching with prism nodes to match on location slices, like `node in Prism::StringNode[content: "foo"]`.
- `Prism.parse_file` and similar now accept anything responding to `to_path` (like `Pathname`) directly.

### Removed
- Removed `Prism::Pack`.

### Changed
- Thoroughly implement void value expression check for Ruby 4.1.
- Add support for `&nil` to declare that a method accepts no block for Ruby 4.1.
- Allow trailing commas in method signatures like `def foo(a,); end` for Ruby 4.1.
- Reject `END { break }` and `END { next }` for Ruby 4.1.
- `a /b/` no longer warns about ambiguous `/` for Ruby 4.1.
- Many improvements to the docs (fixing Markdown on docs.ruby-lang.org, grouping related methods, showing fewer useless methods, etc.).
- The following node fields were renamed for consistency: `InNode#{in,then}_loc` -> `InNode#{in,then}_keyword_loc`, `MatchPredicateNode#operator_loc` -> `MatchPredicateNode#keyword_loc`, `UnlessNode#keyword_loc` -> `UnlessNode#unless_keyword_loc`, `UntilNode#{keyword,closing}_loc` -> `UntilNode#{until,end}_keyword_loc`, `WhenNode#keyword_loc` -> `WhenNode#when_keyword_loc`, `WhileNode#{keyword,closing}_loc` -> `WhileNode#{while,end}_keyword_loc`. Previous names are aliased and will continue to work.

### Fixed
- Many fixes to edge-case syntax to more closely align with `parse.y`.
- Many compatibility fixes to the ripper translator, in particular in regards to the emitted events.
- Handful of compatibility fixes for the parser translator.
- Fix lexing for unterminated strings/heredocs etc.
- Preserve line-continuation only in dedent heredocs.
- Fix error message for block/lambda with `...` argument.
- Handful of fixes for syntax-invalid code that triggers `ASAN` and similar.
- Fix `Source#offsets` with `freeze: true`.
- Fix UTF-8 code units to match the number of bytes in the code unit offsets.
- Don't replicate unary method bug in the parser translator.
- Fix `Prism.parse_comments` locations for the FFI backend.
- `Prism.parse_stream` no longer assumes that the given io is implemented correctly.
- Fix `Comment#trailing` for syntax-invalid edgecase.

## [1.9.0] - 2026-01-27

### Added
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