El 15/03/12 20:07, Daniel Fischer escribió:
On Thursday 15 March 2012, 19:53:56, Daniel Fischer wrote:
On Thursday 15 March 2012, 19:27:18, Juan Miguel Vilar wrote:
Hello, café:
However, when I write
test2 n = runSTUArray $ do
let createArray v n = newArray (1, n) (v::Int)
Here you create a local binding for createArray that gets a monomorphic type, that type is the fixed by the returning of b to
createArray :: Int -> Integer -> ST s (STUArray s Integer Int)
you can make that fail too with enabling {-# LANGUAGE NoMonoLocalBinds #-}
Hmm, what compiler version are you using? When I actually tried to compile that, it failed with
No instance for (MArray a0 Int (ST s))
without language extensions. After enabling MonoLocalBinds, however, it compiled with 6.12.3, 7.0.2, 7.0.4, 7.2.1 and 7.2.2, but 7.4.1 still refused to compile it.
I am using 7.0.3. Adding type signatures solved the problems. And with respect to MonoLocalBinds, it failed after adding NoMonoLocalBinds, without it, everything went fine. Thanks a lot, Juan Miguel -- Juan Miguel Vilar Torres Profesor titular de universidad Vicedirector de la ESTCE para ITIG e ITIS Departamento de Lenguajes y Sistemas Informáticos Escuela Superior de Tecnología y Ciencias Experimentales Universitat Jaume I Av. de Vicent Sos Baynat s/n 12071 Castelló de la Plana (Spain) Tel: +34 964 72 8365 Fax: +34 964 72 8435 jvilar@lsi.uji.es