Permitting trailing commas for record syntax ADT declarations

[Alexander Berntsen]

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- From a lead-developer-who-merges-a-lot point of view, trailing commas
in import lists are a godsend.

import Foo
  (
  fu,
  baz,
  quux,
  )

is brilliant. It lets me add a line,
+ foobar,

and remove a line,
- - fu,

in a very neat manner. Annoying 3-way merges be gone!


It would be *very* useful if the same behaviour existed for record
syntax. I wish this existed on an almost daily basis,

data Foo a b = MkFoo
  {
  fu :: a,
  ba :: b,
  }

If there's not too much opposition to the idea, I would like to take a
stab at implementing this. Any pointers on *how* to implement it,
would be very useful as I'm not familiar with the codebase outside of
libraries/base at all.
- -- 
Alexander
alexander at plaimi.net
https://secure.plaimi.net/~alexander
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