Ian Lynagh schrieb:
On Wed, Feb 24, 2010 at 01:10:38PM +0100, Marcus D. Gabriel wrote:
The documentation for Text.PrettyPrint.HughesPJ states that vcat is the "List version of $$", but it works as the list version ($+$).
So either the documentation needs to be changed or the code. It would be nice to have both versions.
Hi, do you have a actual use case for the "List version of $$" ? It would make a good test I suppose.
It looks like the behaviour changed in
Tue Jun 24 12:37:15 BST 2008 benedikt.huber@gmail.com * fillNB bug, lazy vcat
i.e. the version that came with GHC 6.10. As it's had the current behaviour for some time, it would probably make sense to have a library submission to determine what the behaviour should be, and whether we want another function for the other behaviour: http://www.haskell.org/haskellwiki/Library_submissions
This is indeed a bug; I've reported it back in December 2008, but unfortunately did not file a bug report: http://www.haskell.org/pipermail/libraries/2008-December/011032.html (at the end of the message, starting with [1]) Personally I think the "List version of $+$" is more common, but changing the implementation seems also fine. It would be nice to solve the other (trickier) issue discussed in the mail referenced above as well. cheers, benedikt