Add TruffleRuby CI job#2996
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Add an experimental CI workflow that builds the C extension and runs the test suite on TruffleRuby. The job is marked continue-on-error so it reports the current status without blocking the build.
Add an `omit_on_truffle_ruby!` helper (class-level and instance-level) to centralize skipping tests that cannot pass on TruffleRuby, instead of sprinkling engine checks throughout the suite. Skip whole classes that depend on features TruffleRuby lacks: - prototype tests (RubyVM::AbstractSyntaxTree) - runtime test tester (TracePoint :end event) Skip the few isolated cases in otherwise-supported classes (CLI prototype/ test commands, inline comment parsing via prism, loop Enumerator type checking, invalid UTF-8 handling, GC.compact). With these omitted, the suite is green on TruffleRuby, so drop continue-on-error from the workflow.
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Summary
Adds an experimental CI workflow (
.github/workflows/truffleruby.yml) that builds the C extension and runs the test suite on TruffleRuby, so we can track whether RBS works on TruffleRuby.The job is marked
continue-on-error: truebecause TruffleRuby support is experimental — it reports the current status without blocking the build.Workflow details
trufflerubyviaruby/setup-rubyLANG: en_US.UTF-8(TruffleRuby falls back to US-ASCII and emits warnings/errors when the locale is not UTF-8)bin/setup(compiles the C extension) thenrake testprofilersandtypecheck_testbundle groups (not needed for the smoke test)Verification
Verified locally with TruffleRuby 34.0.1 (
like ruby 3.4.9):rbs_extensionC extension compile/link-Wc++-compatare auto-skipped bymkmf)Known gaps / differences on TruffleRuby:
rbs prototype rb/rbi/runtime—RubyVM::AbstractSyntaxTreeis missing on TruffleRuby (already documented as MRI-only incli.rb).AST::Ruby) — TruffleRuby's prism returnsnilfromPrism::Location#start_line_slice, causing errors.\xFF) does not raiseParsingErroras it does on MRI.So RBS's core functionality works on TruffleRuby, but the full suite is not green yet — hence the
continue-on-errorjob.https://claude.ai/code/session_012razqriUGBbQnyVt6egp22
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