[Haskell-cafe] Pointer equality for nullary constructors

[Joachim Breitner]

Hi,

Am Dienstag, den 20.02.2018, 17:56 -0500 schrieb Gregory Collins:
> You mean like this? https://github.com/gregorycollins/hashtables/blob/master/src/Data/HashTable/Internal/UnsafeTricks.hs#L72
> 
> My experience is that this works, except when doing coverage, where the compiler adds instrumentation code that breaks the technique. I #ifdef'd my way around the problem, swapping out a slower impl when I was doing code coverage.

it seems that in this case,
https://ghc.haskell.org/trac/ghc/ticket/14826
would very much apply, wouldn’t it?

Cheers,
Joachim

-- 
Joachim Breitner
  mail at joachim-breitner.de
  http://www.joachim-breitner.de/
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