Library proposal: add a Location interface for element-wise?operations on Data.Map (#4887)

[Chung-chieh Shan]

Ross Paterson <ross at soi.city.ac.uk> wrote in article <20110107173753.GA9221 at soi.city.ac.uk> in gmane.comp.lang.haskell.libraries:
>   http://code.haskell.org/~ross/containers_doc/Data-Map.html#3

Great!

Given that no function takes two Locations at once, a Location can
be thought of (and implemented) as a record whose fields are "key",
"before", "after", etc.  To support this thought, it would be nice if
all functions that take a Location as argument take it as the first
argument.  That seems already the case except in "assign".

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