From: "Eregon (Benoit Daloze) via ruby-core" <ruby-core@...>
Date: 2026-03-11T09:46:32+00:00
Subject: [ruby-core:124981] [Ruby Bug#21828] An incorrect warning message related to `benchmark` is shown when using `benchmark-ips`

Issue #21828 has been updated by Eregon (Benoit Daloze).


Also happens on `4.0-dev` from `ruby-build` (`ruby 4.0.1 (2026-03-10 revision 21f2bbf322) +PRISM [x86_64-linux]`).

----------------------------------------
Bug #21828: An incorrect warning message related to `benchmark` is shown when using `benchmark-ips`
https://bugs.ruby-lang.org/issues/21828#change-116671

* Author: y-yagi (Yuji Yaginuma)
* Status: Open
* Assignee: hsbt (Hiroshi SHIBATA)
* ruby -v: ruby 4.0.1 (2026-01-13 revision e04267a14b) +PRISM [x86_64-linux]
* Backport: 3.2: DONTNEED, 3.3: DONTNEED, 3.4: DONTNEED, 4.0: DONE
----------------------------------------
## Descrition

When using `benchmark-ips` gem with Ruby 4.0.0, the warning related to `benchmark` gem is shown.

## Step to reproduce

```ruby
# Gemfile
# frozen_string_literal: true

source "https://rubygems.org"

gem "benchmark-ips"
```

```ruby 
# script.rb
require "benchmark/ips"
```

```text
$ bundle exec ruby -v script.rb
ruby 4.0.0 (2025-12-25 revision 553f1675f3) +PRISM [x86_64-linux]
script.rb:1: warning: benchmark/ips is found in benchmark, which is not part of the default gems since Ruby 4.0.0.
You can add benchmark to your Gemfile or gemspec to fix this error.
```

## Expected behavior

The warning for `benchmark` isn't shown when using `benchmark-ips`.

 



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