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T-Ruby v0.0.42 Released

Yonghyun Kim
Yonghyun Kim

T-Ruby v0.0.42 adds full Ruby 4.0 support, released just days after Ruby 4.0's Christmas release. (PR#28)

Ruby 4.0 Support​

📖 See also: CLI Reference

This release brings full compatibility with Ruby 4.0, which was released on Christmas 2025:

RubyVersion Value Object​

A new RubyVersion class handles version parsing, comparison, and feature detection:

version = TRuby::RubyVersion.new("3.2.0")
version.major  # => 3
version.minor  # => 2
version >= TRuby::RubyVersion.new("3.0")  # => true

Version-Specific Code Generation​

The new CodeEmitter strategy pattern generates appropriate code for different Ruby versions:

  • Automatic target Ruby version detection from your environment
  • Version-specific transformations for Ruby 3.0 through 4.0
  • UnsupportedRubyVersionError for versions outside 3.0-4.x range

Block Parameter Type Erasure​

Type annotations are now erased from block parameters.

CI Improvements​

  • Added ruby-head to CI matrix for future compatibility testing
  • continue-on-error enabled for ruby-head builds

Dependency Updates​

  • Added benchmark gem as explicit dependency (resolves deprecation warning)
  • Made listen gem optional to fix Ruby 4.0 ffi compatibility

Upgrade​

gem update t-ruby

Looking Ahead​

With Ruby 4.0 now officially released, T-Ruby continues its commitment to supporting the latest Ruby versions while maintaining backwards compatibility with Ruby 3.0+.