Gem::BasicSpecification#contains_requirable_file?

# File tmp/rubies/ruby-3.1.3/lib/rubygems/basic_specification.rb, line 72
def contains_requirable_file?(file)
  if @ignored
    return false
  elsif missing_extensions?
    @ignored = true

    if Gem::Platform::RUBY == platform || Gem::Platform.local === platform
      warn "Ignoring #{full_name} because its extensions are not built. " +
           "Try: gem pristine #{name} --version #{version}"
    end

    return false
  end

  have_file? file, Gem.suffixes
end