feat: Support Ruby 4.0#238
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… Ruby 4.0 ``` $ toys ci /Users/sue445/workspace/github.com/GoogleCloudPlatform/functions-framework-ruby/lib/functions_framework.rb:15: warning: logger used to be loaded from the standard library, but is not part of the default gems since Ruby 4.0.0. You can add logger to your Gemfile or gemspec to fix this error. /Users/sue445/.rbenv/versions/4.0.2/lib/ruby/4.0.0/bundled_gems.rb:60:in 'Kernel.require': cannot load such file -- logger (LoadError) from /Users/sue445/.rbenv/versions/4.0.2/lib/ruby/4.0.0/bundled_gems.rb:60:in 'block (2 levels) in Kernel#replace_require' from /Users/sue445/workspace/github.com/GoogleCloudPlatform/functions-framework-ruby/lib/functions_framework.rb:15:in '<top (required)>' from /Users/sue445/.rbenv/versions/4.0.2/lib/ruby/4.0.0/bundled_gems.rb:60:in 'Kernel.require' from /Users/sue445/.rbenv/versions/4.0.2/lib/ruby/4.0.0/bundled_gems.rb:60:in 'block (2 levels) in Kernel#replace_require' from /Users/sue445/workspace/github.com/GoogleCloudPlatform/functions-framework-ruby/test/helper.rb:19:in '<top (required)>' from /Users/sue445/.rbenv/versions/4.0.2/lib/ruby/4.0.0/bundled_gems.rb:60:in 'Kernel.require' from /Users/sue445/.rbenv/versions/4.0.2/lib/ruby/4.0.0/bundled_gems.rb:60:in 'block (2 levels) in Kernel#replace_require' ```
…n Ruby 4.0 ``` $ toys ci test/test_function.rb:16: warning: ostruct used to be loaded from the standard library, but is not part of the default gems since Ruby 4.0.0. You can add ostruct to your Gemfile or gemspec to fix this error. /Users/sue445/.rbenv/versions/4.0.2/lib/ruby/4.0.0/bundled_gems.rb:60:in 'Kernel.require': cannot load such file -- ostruct (LoadError) Did you mean? tsort from /Users/sue445/.rbenv/versions/4.0.2/lib/ruby/4.0.0/bundled_gems.rb:60:in 'block (2 levels) in Kernel#replace_require' from test/test_function.rb:16:in '<top (required)>' from /var/folders/kh/pcns6sf91tnfk6k6b4vqtz8r0000gn/T/toys-minitest-script-20260611-15935-rmwq9y.rb:7:in 'Kernel#load' from /var/folders/kh/pcns6sf91tnfk6k6b4vqtz8r0000gn/T/toys-minitest-script-20260611-15935-rmwq9y.rb:7:in '<main>' ```
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Currently, the latest version of Ruby is the 4.0 series.
Running the code on Ruby 4.0.x results in the following error:
This is caused by
loggerandostructbeing promoted from default gems to bundled gems in Ruby 4.0.0.https://www.ruby-lang.org/en/news/2025/12/25/ruby-4-0-0-released/#stdlib-updates
Therefore, I have added these gems as runtime dependencies.