From: "Eregon (Benoit Daloze) via ruby-core" <ruby-core@...>
Date: 2026-03-11T09:56:19+00:00
Subject: [ruby-core:124983] [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).


A main difference between both reproductions are the Gemfile.lock, for the reproduction in the issue description:
```
GEM
  remote: https://rubygems.org/
  specs:
    benchmark-ips (2.14.0)

PLATFORMS
  ruby
  x86_64-linux

DEPENDENCIES
  benchmark-ips

CHECKSUMS
  benchmark-ips (2.14.0) sha256=b72bc8a65d525d5906f8cd94270dccf73452ee3257a32b89fbd6684d3e8a9b1d

BUNDLED WITH
  4.1.0.dev
```

and for the reproduction from https://bugs.ruby-lang.org/issues/21828#note-6:
```
GEM
  remote: https://rubygems.org/
  specs:
    drb (2.2.3)
    minitest (6.0.2)
      drb (~> 2.0)
      prism (~> 1.5)
    prism (1.9.0)
    rake (13.3.1)

PLATFORMS
  ruby
  x86_64-linux

DEPENDENCIES
  minitest
  rake (>= 10.5)

CHECKSUMS
  drb (2.2.3) sha256=0b00d6fdb50995fe4a45dea13663493c841112e4068656854646f418fda13373
  minitest (6.0.2) sha256=db6e57956f6ecc6134683b4c87467d6dd792323c7f0eea7b93f66bd284adbc3d
  prism (1.9.0) sha256=7b530c6a9f92c24300014919c9dcbc055bf4cdf51ec30aed099b06cd6674ef85
  rake (13.3.1) sha256=8c9e89d09f66a26a01264e7e3480ec0607f0c497a861ef16063604b1b08eb19c

BUNDLED WITH
  4.0.3
```

So it seems like the fix only works when there is a dependency on the `benchmark-ips` gem, but there could be `benchmark/something` files outside a gem and then it still warns incorrectly.

----------------------------------------
Bug #21828: An incorrect warning message related to `benchmark` is shown when using `benchmark-ips`
https://bugs.ruby-lang.org/issues/21828#change-116673

* 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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