Gem::Commands::OpenCommand#open_gem

# File tmp/rubies/ruby-3.3.0/lib/rubygems/commands/open_command.rb, line 59
def open_gem(name)
  spec = spec_for name

  return false unless spec

  if spec.default_gem?
    say "'#{name}' is a default gem and can't be opened."
    return false
  end

  open_editor(spec.full_gem_path)
end