On 02/11/2010 07:37, Sittampalam, Ganesh wrote:
I've just been updating darcs 2.5 for GHC 7.0. I had to add about 40 signatures for MonoLocalBinds in about 140 files/30K LOC. Is that about normal? darcs does make fairly heavy use of rank 2 polymorphism which leads to quite a lot of local definitions needing to be polymorphic.
Sounds about right given my experience so far, but as you say it depends a lot on the style of code involved. Some people tend to write a lot more polymorphic local bindings than others :-)
Also, NoMonoLocalBinds didn't help at all, which surprised me a bit - I thought it might at least make some of the signatures unnecessary.
I suspect MonoLocalBinds is being turned on again by an option later in the ordering. I had this problem a lot when trying to use NoMonoLocalBinds, it's actually quite hard to make it stick. e.g. if you have LANGUAGE GADTs in the source file, that will override NoMonoLocalBinds on the command line. I'm not sure what (if anything) we should do about this.
Finally, is NoMonoLocalBinds supposed to imply NPlusKPatterns? The only changes I was able to revert when I enabled it were a couple of those!
It certainly is not, if you have evidence to the contrary please submit a bug report. Cheers, Simon
Cheers,
Ganesh
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