[galaxyLogic]

Using a fancy parser-library would mean we should also count the lines of code in it. It would basically mean adapting an existing solution. In practice that would make a lot of sense, but if the purpose is to compare the productivity of different languages then not so much.

[geofft]

Isn't it a facet of productivity of the language that it's easier to write certain types of libraries in one language than another? If you're writing a compiler, the fact that lots of people write parser libraries in Haskell is a point in favor of Haskell, whether if you intend to use those libraries (because they're available and production-tested) or you intend to write your own (because it's demonstrably a productive language for that sort of work).

[galaxyLogic]

Yes from the outset. But this study was about writing a parser and it seems Haskell didn't do much better than the others.