qualified import of prelude

[Andrew Frank]

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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http://www.geoinfo.tuwien.ac.at/persons/frank/frank.html

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