> (1) unhelpful error message from GHCi:
>
> [[
> Compiling ParsecPrim ( F:\Haskell\Lib/ParsecPrim.hs,
> interpreted )
> WARNING: ignoring polymorphic case in interpreted mode.
> Possibly due to strict polymorphic/functional constructor args.
> Your program may leak space unexpectedly.
> ]]
> I don't understand what this is trying to say, and the lack
> of a source
> code line number doesn't give me any chance to study the code for
> clues. This warning is GHCi only.
It is warning you about a bug in GHC. Fortunately, the bug has been
fixed in the forthcoming 6.0 release.
> (2) Strange behaviour of GHCs Time.diffClockTimes function:
>
> This code fragment:
> [[
> runTest t =
> do { st <- Time.getClockTime
> ; putStr $ "Test started: "++show st++"\n"
> ; runTestTT t
> ; ft <- Time.getClockTime
> ; putStr $ "Test finished: "++show ft++"\n"
> ; let et = Time.diffClockTimes ft st
> ; putStr $ "Test duration: "++show et++"\n"
> }
> ]]
>
> yields this output:
> [[
> Test duration: TimeDiff {tdYear = 0, tdMonth = 0, tdDay = 0,
> tdHour = 0,
> tdMin = 0, tdSec = 9, tdPicosec = -437000000000}
> ]]
This is reasonable, as far as I can tell. The only requirement on a
TimeDiff is that:
t1 `addToClockTime` (t1 `diffClockTimes` t2) == t2
and the TimeDiff above does just that. It *could* be normalised so that
the signs of the two components are the same, but the current
implementation doesn't do that.
Cheers,
Simon
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