Ruby Issue Tracking System

01/04/2026

03:05 PM Ruby Bug #21823 (Open): $! is nil inside rescue block when $! is accessed before raise in Ruby::Box

## Description
When Ruby::Box is enabled (`RUBY_BOX=1`), accessing `$!` before a `raise` statement causes `$!` to be `nil` inside the subsequent `rescue` block, instead of containing the raised exception.
## Reproduction
`... ahogappa (sho hirano)

12/31/2025

11:49 PM Ruby Bug #21817 (Assigned): Ruby::Box crashes with refinement + bind_call + Symbol#to_proc combination

## Description
When running with `RUBY_BOX=1`, a combination of refinement on Binding class, `bind_call`, and `Symbol#to_proc` causes a crash with the error: `[BUG] BUG: Local ep without cme/box, flags: 66660087`
## Reproduction ... ahogappa (sho hirano)