Update RBS to 4.2.0 - #2277
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Require `rbs` 4.2 rather than 4.0. ruby/rbs#3067 fixes type param alignment for module self types, which Steep relies on when it validates mixin constraints, and the fix is not backported to the 4.1 series. RBS 4.2 requires Ruby 3.3, so `required_ruby_version` moves up to match. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
It landed in Ruby 3.3, which is now the minimum supported version. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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The gem dependency moves from
rbs ~> 4.0to~> 4.2. ruby/rbs#3067 fixes type param alignment for module self types, which Steep relies on when it validates mixin constraints, and it is not backported to the 4.1 series.RBS 4.2 requires Ruby 3.3, so
required_ruby_versionmoves up to match and thedefined?(Process.warmup)check inTypeCheckWorkergoes away --Process.warmuplanded in 3.3. Nothing else inlib/was gated on the Ruby version, and CI already runs 3.3, 3.4 and 4.0.