On Tue, 30 Jun 2009, Bryan O'Sullivan wrote:
I've thought for a while that it would be very nice indeed if the Monoid class had a more concise operator for infix appending than "a `mappend` b". I wonder if other people are of a similar opinion, and if so, whether this is worth submitting a libraries@ proposal over.
We have the package version policy which relies on explicit or qualified imports, such that adding a function like (++) to Data.Monoid cannot harm any package that follow that policy. Thus I vote for not introducing a new operator, in order to keep the set of infix operators to memorize small, but use (++) for the generalized (List.++) aka mappend. The user would however need to hide (++) from Prelude.
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