source=

# File lib/bundler/stub_specification.rb, line 19
      def source=(source)
        super
        # Stub has no concept of source, which means that extension_dir may be wrong
        # This is the case for git-based gems. So, instead manually assign the extension dir
        return unless source.respond_to?(:extension_dir_name)
        path = File.join(stub.extensions_dir, source.extension_dir_name)
        stub.extension_dir = File.expand_path(path)
      end