Hi,

I would like hear some discussion on grouping of branches in `case of` 
statement . Currently it is not possible to use one branch for multiple 
conditions.

Something along these lines:

case someTypeValue of
    A ->
        -- code

    B ->
    C ->
    D ->
        -- different code


Current alternative is this

case someTypeValue of
    let
        stuff2 =
            -- code      
    in
        A ->
            -- different code

        B ->
            stuff2

        C ->
            stuff2
            
        D ->
            stuff2


Which is unnecessarily verbose and harder to read.

One question is how this would work when there in cases where matched 
patterns have some values attached to them

case someTypeValue of
    A ->
        -- stuff1


    B _ ->
    C _ _ ->
    D _ _ _ ->
        -- stuff2

How is this handled in other languages like OCaml or Haskell?

NOTE: moved from https://groups.google.com/forum/#!topic/elm-dev/DtUT2ieYTDo

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