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August 2022
- 1 participants
- 1 discussions
Strange: on loading this module, Hugs complains (this is standard-issue Sep
2006 Hugs in Hugsmode)
> - An instance of ShowRecRow (x :: a, y :: a) is required to derive Show
(NPoint a)
Just loading it again and the complaint disappears.
> module NPoint where
>
> import Hugs.Trex
>
> newtype Num a => NPoint a = MkNPoint ( Rec( x :: a, y :: a))
deriving (Eq, Show)
>
If I ask for :info ShowRecRow after the failed load, I see an instance each
for label x, y -- as well as the EmptyRow instance (standard with
Hugs.Trex). If I :load Hugs.Trex after the failed load, those two instances
have gone; I can load NPoint ok.
On firing up Hugs, if I :load Hugs.Trex before :load NPoint, the error
still happens. But if I
>print (z = 5) -- some arbitrary label
then :load NPrint, all is fine. (And there's no ghost ShowRecRow instance
for z.)
If I 'clear modules' after the failed load; then :load NPoint, no error.
Same for an ordinary data decl wrapping a Trex record, with deriving. Same
if I include some arbitrary `silly = show (silly = "shilly")`.
AntC
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