Proposal #3339: Add (+>) as a synonym for mappend
igloo at earth.li
Mon Nov 7 16:44:38 CET 2011
On Sun, Nov 06, 2011 at 11:58:10PM -0500, Edward Kmett wrote:
> On Sun, Nov 6, 2011 at 8:33 PM, Ian Lynagh <igloo at earth.li> wrote:
> > On Mon, Nov 07, 2011 at 01:13:23AM +0000, Duncan Coutts wrote:
> > >
> > > So maybe we should just conclude that pretty printing should be left
> > > associative, building from the left.
> > To clarify, Duncan and I are now thinking that as pretty builds
> > left-to-right strings, perhaps it is natural that the operators in
> > a <+> b <> c <+> d <> e <+> ...
> > should be left-infix, as it is natural to read this as "a then b, then
> > c, ..."
> I'm not sure I follow.
> It would seem that accessing a then (b then ...) would require me to have
> it associated to the right, otherwise I have
> (((((...(a then b) then c) and I can't even start figuring out what I'm
> going to do until I crawl my way down to the bottom.
You're talking about the relative performance of the two options. I'm
talking about the semantics you would expect if you didn't think about
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