[GHC] #14163: Stack Overflow with ApplicativeDo

[GHC]

#14163: Stack Overflow with ApplicativeDo
-------------------------------------+-------------------------------------
        Reporter:  lippling          |                Owner:  simonmar
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.2
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:  ApplicativeDo
Operating System:  MacOS X           |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3900
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by simonmar):

 @lippling: there's one other workaround, which is to add a ~ to your
 patterns, like so:

 {{{
 x = do
     ~(a, _) <- undefined
     ~(b, _) <- undefined
     ~(c, _) <- undefined
     undefined
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14163#comment:10>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler