Ruby Issue Tracking System

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12:21 AM Ruby Bug #21991 (Closed): `$!` stays as the first exception in Ruby Box

Applied in changeset commit:git|d4727cd4e63c7bc1bc95a96b7f3c6de568bc5b6e.
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Ruby::Box fix stale cached values for exception-related global variables ($! and $@)
Ruby::Box fix stale cached values for exception-related global va... dak2 (Daichi Kamiyama)

12:21 AM Ruby Revision d4727cd4 (git): Ruby::Box fix stale cached values for exception-related global variables ($! and $@)

Ruby::Box fix stale cached values for exception-related global variables ($! and $@)
The exception-related virtual variables $! (current exception) and
$@ (its backtrace) are stored on the execution context (ec->errinfo
and the rescue/e... dak2 (Daichi Kamiyama)

05/05/2026

11:20 AM Ruby Bug #21991: `$!` stays as the first exception in Ruby Box

I created a patch for this issue.
https://github.com/ruby/ruby/pull/16863
@tagomoris Could you review this? dak2 (Daichi Kamiyama)

05/01/2026

03:10 AM Ruby Bug #21940 (Closed): Ruby::Box: `$_` returns stale value due to gvar_tbl caching

Applied in changeset commit:git|f89b07ef0046257dd796a2e615cc063072114f16.
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Mark `$_` as box-dynamic to bypass Box gvar_tbl cache
`$_` is updated through svar (rb_lastline_set), bypassing
rb_gvar_set, so the Box gvar_tbl cache... dak2 (Daichi Kamiyama)

03:10 AM Ruby Revision f89b07ef (git): Mark `$_` as box-dynamic to bypass Box gvar_tbl cache

`$_` is updated through svar (rb_lastline_set), bypassing
rb_gvar_set, so the Box gvar_tbl cache is never invalidated
and returns a stale value. Call rb_gvar_box_dynamic so
gvar_use_box_tbl() skips the cache.
Fixes [Bug #21940](https://... dak2 (Daichi Kamiyama)

03/16/2026

01:37 PM Ruby Bug #21940: Ruby::Box: `$_` returns stale value due to gvar_tbl caching

At last week's Asakusa.rb, I realized that `$~` was facing a similar issue. I've also made the necessary fixes in the PR mentioned above.
https://github.com/ruby/ruby/pull/16303#issuecomment-4067703448 dak2 (Daichi Kamiyama)

03/04/2026

03:36 PM Ruby Bug #21940: Ruby::Box: `$_` returns stale value due to gvar_tbl caching

Patch: https://github.com/ruby/ruby/pull/16303 dak2 (Daichi Kamiyama)

03:25 PM Ruby Bug #21940 (Closed): Ruby::Box: `$_` returns stale value due to gvar_tbl caching

## Environment
- Ruby Version v4.0.1
- OS: macOS 15.6.1 (arm64)
- `RUBY_BOX=1` enabled
## Reproduction
```shell
echo -e "a\nb" | RUBY_BOX=1 ruby -e 'gets; $_; gets; p $_'
```
## Expected
```
"b\n"
```
The secon... dak2 (Daichi Kamiyama)