Sergey,
> I have an impression that interactive `let' in
> ghc-5.00.2 (binary distribution for linux i386-unknown)
>
> looses visibility of some instances.
> Having installed my ghc package docon, with its libraries,
> I command
>
> ghci $doconOpts
> ...
> Loading package docon ... linking ... done.
> Prelude> :m DExport
> DExport> let {q1 = 1:/1 :: Fraction Z; dQ = upField q1 eFM;
> (_,rR) = baseRing q1 dQ
> }
> in subringChar rR
> Just 0
>
> - and this is correct.
> Changing the `let' part to DExport> let q1 = 1:/1 :: Fraction Z
> DExport> let dQ = upField q1 eFM
> yields the report
>
> <no file>:0:
> No instance for `Field (Fraction Z)'
> arising from use of `upField' at <no file>:0
> in the definition of function `dQ': upField q1 eFM
We believe this bug is now fixed. Hopefully we'll get a snapshot out
within the next day or two; it would be helpful if you could try it out
and let us know if it fixes the bug for you.
Cheers,
Simon
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