performance regressions

Joachim Breitner mail at
Tue Dec 16 09:01:30 UTC 2014


Am Montag, den 15.12.2014, 23:48 -0500 schrieb Richard Eisenberg:
> Can anyone tell me: why? Have I made some horrible mistake in the implementation? 
> And, relatedly: how can I fix this? I want to learn from this experience how to avoid this problem next time...

another guess (without looking at the code, sorry): Are they in the same
module? I.e., can GHC specialize the code to your particular Monad?


Joachim Breitner
  e-Mail: mail at
  Jabber-ID: nomeata at

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 819 bytes
Desc: This is a digitally signed message part
URL: <>

More information about the ghc-devs mailing list