A tiny Ruby-subset interpreter in Rust, built on top of Prism
CRuby-shape C ABI for hosting C extensions inside rubyrs (spike: Level 0)
Zero-copy Gemfile.lock parser library, with a placeholder CLI ahead of full bundle commands.
Scans Ruby codebases for AST features rubyrs cannot translate, to quantify and prioritise the subset gap.
Mechanically rewrites ruby/spec files into the assert_eq / assert_raises shape rubyrs's micro-runner understands.