Ruby Issue Tracking System

08/02/2025

02:23 PM Ruby Bug #21528 (Closed): SyntaxError#message may have broken encoding with multibyte source under Prism

Since the introduction of Prism, when parsing Ruby source code that contains multibyte characters, SyntaxError#message can sometimes have invalid encoding.
Here is a reproducible example:
```
begin
RubyVM::InstructionSequence.compi... alpaca-tc (Hiroyuki Ishii)

06/09/2025

03:33 AM Ruby Bug #21201 (Closed): Performance regression when defining methods inside `refine` blocks

Applied in changeset commit:git|c8ddc0a843074811b200673a2019fbe4b50bb890.
----------
Optimize callcache invalidation for refinements
Fixes [Bug #21201]
This change addresses a performance regression where defining methods
inside `refi... alpaca-tc (Hiroyuki Ishii)

03:33 AM Ruby Revision c8ddc0a8 (git): Optimize callcache invalidation for refinements

Fixes [Bug #21201]
This change addresses a performance regression where defining methods
inside `refine` blocks caused severe slowdowns. The issue was due to
`rb_clear_all_refinement_method_cache()` triggering a full object
space scan v... alpaca-tc (Hiroyuki Ishii)

04/07/2025

02:16 PM Ruby Bug #21201: Performance regression when defining methods inside `refine` blocks

byroot (Jean Boussier) wrote in #note-1:
> The solution is likely to keep the list (set) of all existing call caches that belong to a refinement, as to save the object space traversal.
I created a pull request based on this approach.... alpaca-tc (Hiroyuki Ishii)

03/27/2025

11:20 AM Ruby Bug #21201 (Closed): Performance regression when defining methods inside `refine` blocks

After the change introduced in [PR #10037](https://github.com/ruby/ruby/pull/10037), a significant performance regression has been observed when defining methods within refine blocks.
The PR correctly fixes a bug where `callcache` inv... alpaca-tc (Hiroyuki Ishii)

03/08/2024

09:23 AM Ruby Revision e8f796e9 (git): [ruby/irb] rdoc version lock is required

(https://github.com/ruby/irb/pull/897)
Some features of irb do not work properly when using the old rdoc.
I have compared several major versions and found that it works as intended from 4.0.0.
This problem occurs when there is a Gemfil... alpaca-tc (Hiroyuki Ishii)

11/04/2023

03:54 PM Ruby Revision 8ed733f8 (git): ast.rb: Fix bug for source of multibyte characters

first_column and last_column return byte positions, but existing implementations
did not consider multibyte. alpaca-tc (Hiroyuki Ishii)

04/11/2023

02:08 AM Ruby Bug #19589 (Closed): Expecting system stack error but crashing

The following code expects stack overflow but crashes.
The version it occurs in is newer than 3.2.0.
```
def expect_system_stack_error(h)
h.each_key {}
h.each_value { expect_system_stack_error(h) }
end
expect_system_stack_... alpaca-tc (Hiroyuki Ishii)

01/22/2021

04:32 PM Ruby Bug #17494: ruby is hanged when using activesupport + rspec + rspec-parameterized

I investigated this issue deeply based on yhonda's example code. Then I succeeded to create tiny reproduction code.
```ruby
Object.prepend(Module.new)
using(Module.new {
refine Object do
def hello; end
end
})
Object... alpaca-tc (Hiroyuki Ishii)

12/26/2016

04:59 AM Ruby Bug #13074 (Closed): When executing instance_exec with symbol.to_proc, it ignores first argument.

Is this intentional?
```
# Ruby 2.3.3
« instance_exec(1) { |i| i.itself }
=> 1
« instance_exec(1, &:itself)
=> 1
# Ruby 2.4.0
« instance_exec(1) { |i| i.itself }
=> 1
« instance_exec(1, &:itself)
=> main
``` alpaca-tc (Hiroyuki Ishii)