[tannevaled]

The page said the unswept trees are "not run at all" and stopped there. That is honest and useless on its own: a reader cannot tell whether the unmeasured half of ruby/spec is a rounding error or the bulk of the work.

They have now been measured once, on 2026-11-10, against MRI 4.0.7 through the same shim — a dated run, said on the page to be one, and not a gate.

Across the 970 files where the two engines differ the gap is 2,341 examples, and the shape matters more than the size:

• 78 files cannot be measured at all. Every command_line/ spec is built on ruby_exe, and optional/capi needs a compiled C extension — MRI itself scores zero in them. That share asks for harness work, not interpreter work.
• The largest single debt is a hang, not a missing feature. Net::FTP is 442 examples behind, with 39 of its 56 files killed by the clock on rbgo and none on MRI.
• The outright absences are comparatively small — Coverage 53 examples, WeakRef 9.

Verified with the pinned command this lane runs:

$ go run github.com/go-embedded-ruby/docs/tools/[email protected] --root .
6 total claim(s), 1 version claim(s) and 3 stubbed-helper mention(s) checked
against the gate's 23672 at Ruby 4.0.9 (derived from RUBY_VERSION);
the shim stubs output_to_fd, ruby_cmd, ruby_exe

Refs go-embedded-ruby/ruby#916 — it stays open; this page only stops leaving the
reader to guess what the unswept half contains.

🤖 Generated with Claude Code