Why are there no Show instances for internal types

[Joachim Breitner]

Hi,

Am Montag, den 20.03.2017, 12:51 +0000 schrieb Simon Peyton Jones via ghc-devs:
> Show and Outputable have very different goals though.
> 
> Really? What's wrong with using Outputable, plus, as Joachim says, 
> 
> 	showSDocUnsafe . ppr :: Outputable a => a -> String
> 
> Maybe you want to really really see the precise data constructors
> used.  But for the most part the Outputable instance tells you that,
> but much more legibly.

and if using Outputable is a bit annoying sometimes (e.g. I found it
hard to get the IdInfo of an Id that is not part of a binder, if I
recall correctly, because the default instance does not include that
info, and the pretty printer for “id with idinfo” is not exported),
well, we can always improve that by adding a few more helpful functions
to Outputable.

Greetings,
Joachim

-- 
Joachim “nomeata” Breitner
  mail at joachim-breitner.de • https://www.joachim-breitner.de/
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  Debian Developer: nomeata at debian.org
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