Proposal: Add concatMapM function (#2042)

[Aaron Denney]

On 2008-02-01, Roman Leshchinskiy <rl at cse.unsw.edu.au> wrote:
> Bulat Ziganshin wrote:
>> 
>> the right way to deal with "modifiers" is to attach them to the Handle
>> itself like this:
>> 
>> f <- openFile "name" >>= withLocking >>= withEncoding utf8
>
> IMO, global state is never "the right way" if it can be avoided. It will 
> always lead to problems. Especially in a functional language like Haskell.

This isn't global state, but local to the handle, and only affects where
the handle is passed in.  It's just extending an opaque data type.

-- 
Aaron Denney
-><-