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instance method
Gem::Commands::RebuildCommand#rubygems_version
rubygems_version(gem_file)
lib/rubygems/commands/rebuild_command.rb
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# File tmp/rubies/ruby-3.4.1/lib/rubygems/commands/rebuild_command.rb, line 259
def rubygems_version(gem_file)
Gem::Package.new(gem_file).spec.rubygems_version
end
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