AR 5/3/2011

Example on using GADT and composOp in transfer.

To compile:

  make

To test:

  echo "this expensive boring wine is warm" | ./VeryFoods
  this expensive very boring wine is warm

  echo "deze dure wijn is saai" | ./VeryFoods
  deze dure wijn is erg saai

Functionality: wraps every occurrence of "boring" with "very".

This is implemented with a function that needs only two cases: one for "Boring" and another
for the rest of trees. On the method, see 

  B. Bringert and A. Ranta. 
  A Pattern for Almost Compositional Functions. 
  Journal of Functional Programming, 18(5-6), pp. 567-598, 2008.
  http://www.cse.chalmers.se/alumni/bringert/publ/composOp-jfp/composOp-jfp.pdf

Source code:

  VeryFoods.hs                        -- main Haskell module, hand-written
  Makefile
  Foods.gf, FoodsEng.gf, FoodsDut.gf  -- from GF/contrib/summerschool/foods/

Foods.hs and Foods.pgf are generated by 'make'.