i seem to have a problem with a qualified import of the prelude in hugs nov03, haskell extensions, under windows:
Reading file "C:\gisTheoryCodeSept03\lib\Language\Value240.hs":
ERROR "C:\gisTheoryCodeSept03\lib\Language\Value240.hs":207 - Ambiguous
variable occurrence "quotRem"
*** Could refer to: Language.Value240.quotRem Hugs.Prelude.quotRem
the relevant code is:
instance Ring Float where
quotRem a b = (toFloat i, toFloat (b * f))
where ab = a/b
i::Int
(i,f) = Prelude.properFraction ab
rem a b = f where (i,f) = quotRem a b --here is line 240
with the
error
(*) = (Prelude.*)
quot a b = i where (i,f) = quotRem a b
div = error "div not implemented for float"
mod a b = error "mod not implemented for float"
i had a similar error (redefining a class Integral and a complaint in the
export list of ambiguit between the local definition and the qualified
import). it seems that qualified import of the prelude is not properly
handled?
unfortunately this is not a small file and i did not manage to isolate the
problem quickly in a small example. can you see what is wrong here? the
file value240.hs is attached.
thank you for your attention
andrew
Andrew U. Frank
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TU Vienna secr. +43 1 588 01 12700
Gusshausstrasse 27-29 fax +43 1 588 01 12799
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http://www.geoinfo.tuwien.ac.at/persons/frank/frank.html
value240.hs
Description: haskell
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