Recognizing default method implementations

[Erdi, Gergo]

PUBLIC


PUBLIC

Basically I want to skip everything that can't possibly needed after full specialization, i.e. dictionary and default method definitions and method accesors. But I realize now that I should just look at the types, and skip anything with a non-empty context, since after full specialization I should, transitively, also have no need for normal top-level function definitions that have a context.

From: Simon Peyton Jones <simonpj at microsoft.com>
Sent: Wednesday, December 1, 2021 4:57 PM
To: Erdi, Gergo <Gergo.Erdi at sc.com>
Cc: GHC <ghc-devs at haskell.org>
Subject: [External] RE: Recognizing default method implementations


PUBLIC

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Is there a way to recognize that an Id / Var refers to a default method implementation, e.g. $dm/= in the following?

I'm afraid not.  There has never been a reason to do so.  And it might not be robust e.g. it might be inlined.

What is the problem you are trying to solve?

Simon

PS: I am leaving Microsoft at the end of November 2021, at which point simonpj at microsoft.com<mailto:simonpj at microsoft.com> will cease to work.  Use simon.peytonjones at gmail.com<mailto:simon.peytonjones at gmail.com> instead.  (For now, it just forwards to simonpj at microsoft.com<mailto:simonpj at microsoft.com>.)

From: ghc-devs <ghc-devs-bounces at haskell.org<mailto:ghc-devs-bounces at haskell.org>> On Behalf Of Erdi, Gergo via ghc-devs
Sent: 01 December 2021 05:22
To: 'GHC' <ghc-devs at haskell.org<mailto:ghc-devs at haskell.org>>
Subject: [EXTERNAL] Recognizing default method implementations


PUBLIC

Hi,

Is there a way to recognize that an Id / Var refers to a default method implementation, e.g. $dm/= in the following?

$dm/= :: forall a. Eq a => a -> a -> Bool
[GblId, Arity=3, Unf=OtherCon []]
$dm/=
  = \ (@a_ahz)
      ($dEq_sI6 [Occ=Once1] :: Eq a_ahz)
      (x_sI7 [Occ=Once1] :: a_ahz)
      (y_sI8 [Occ=Once1] :: a_ahz) ->
      case == @a_ahz $dEq_sI6 x_sI7 y_sI8 of {
        False -> True;
        True -> False
      }


Thanks,
Gergo

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