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Fix a build error in the Ruby 3.1 CI matrix

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## Motivation and Context

This resolves the following build failure that occurs when using Ruby 3.1 with I18n 1.15.0:

```console
$ bundle exec rake
(snip)

/Users/koic/.rbenv/versions/3.1.5/lib/ruby/gems/3.1.0/gems/i18n-1.15.0/lib/i18n.rb:58:
in `config': undefined method `[]' for Fiber:Class (NoMethodError)

      current = Fiber[:i18n_config] || self.config = I18n::Config.new
                     ^^^^^^^^^^^^^^
        from /Users/koic/.rbenv/versions/3.1.5/lib/ruby/gems/3.1.0/gems/i18n-1.15.0/lib/i18n.rb:88:in `load_path'
```

https://github.com/modelcontextprotocol/ruby-sdk/actions/runs/27724973112/job/82025136923

According to the report in https://github.com/ruby-i18n/i18n/issues/735,
this issue has been fixed in I18n 1.15.1 and later.
However, the already released I18n 1.15.0 still triggers the build error.

While this could potentially be addressed in a better way on the I18n side,
this change updates the Gemfile to avoid using I18n 1.15.0, which is known to cause the issue.

## How Has This Been Tested?

The build error described above has been resolved.

## Breaking Changes

None.
This commit is contained in:
Koichi ITO 2026-06-18 09:05:42 +09:00
commit cfc9a699d6
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Gemfile
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@ -17,6 +17,8 @@ gem "rackup", ">= 2.1.0"
gem "activesupport"
# Fix io-console install error when Ruby 3.0.
gem "debug" if RUBY_VERSION >= "3.1"
# Avoid i18n 1.15.0, which breaks on Ruby 3.1 (ruby-i18n/i18n#735).
gem "i18n", "!= 1.15.0"
gem "rake", "~> 13.0"
gem "sorbet-static-and-runtime" if RUBY_VERSION >= "3.0"
gem "yard", "~> 0.9"