Am 08.01.2012 04:39, schrieb Bogdan Opanchuk:
Hello,
Consider the following code:
{-# LANGUAGE MultiParamTypeClasses, FlexibleInstances, OverlappingInstances, UndecidableInstances, FunctionalDependencies #-}
We have also such (cruel) code using these extension.
t4.hs:17:31: Context reduction stack overflow; size = 21 Use -fcontext-stack=N to increase stack size to N
Our code compiles with ghc-7-0.4 if we add -fcontext-stack=31 to the ghc command line. Does your code compile with an increased (try 100) context-stack? [..]
So, the question is, could anyone please tell me, is what I am trying to do actually correct, and what was changed from 7.0.4 to 7.2.2 to make it work?
I cannot answer this, but our code also compiles with ghc-7.2.2 using a lower context-stack (of 26). HTH Christian
Thank you in advance.
Best regards, Bogdan