normalize f_arglist to make it easier to pattern-match
[git-p4: depot-paths = "//src/ruby_parser/dev/": change = 9111]
Added explicit MIT license
[git-p4: depot-paths = "//src/ruby_parser/dev/": change = 9112]
- 2.0: Fixed paren-less kwargs in defn.
[git-p4: depot-paths = "//src/ruby_parser/dev/": change = 9113]