[GHC] #8325: Pattern guards in anonymous functions

[GHC]

#8325: Pattern guards in anonymous functions
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        Reporter:  mcollis           |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by goldfire):

 `MultiWayIf` uses layout to fix this ambiguity, essentially requiring all
 the `|` to line up. I find this a bit annoying (but don't have a better
 idea), because I want to say

 {{{
 if |  blah
    -> blah
    |  blah
    -> blah
 }}}

 which is disallowed. Instead, I need to indent the arrows.

 In any case, the layout approach should work for lambdas, I think.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8325#comment:2>
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