[GHC] #7851: Give better diagnostic when arguments are omitted to a function call in do-notation

[GHC]

#7851: Give better diagnostic when arguments are omitted to a function call in do-
notation
----------------------------------+-----------------------------------------
    Reporter:  JohnWiegley        |       Owner:                                   
        Type:  feature request    |      Status:  new                              
    Priority:  normal             |   Milestone:                                   
   Component:  Compiler (Parser)  |     Version:  7.4.2                            
    Keywords:                     |          Os:  MacOS X                          
Architecture:  x86_64 (amd64)     |     Failure:  Incorrect warning at compile-time
  Difficulty:  Unknown            |    Testcase:                                   
   Blockedby:                     |    Blocking:                                   
     Related:                     |  
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Comment(by simonpj@…):

 commit 6d8d0dd94e3216ba2792f1eb9e9e086f188e1c56
 {{{
 Author: Simon Peyton Jones <simonpj at microsoft.com>
 Date:   Mon Apr 29 17:31:21 2013 +0100

     Exend the "Too few args" message for naked Ids (Trac #7851)

     Previously, for
       f :: [Bool]
       f = map not

     we'd get a helpful message
         Probable cause: ‛map’ is applied to too few arguments

     but not for
       f :: [Bool]
       f = map

     which seems a bit stupid.

  compiler/typecheck/TcExpr.lhs |   47
 +++++++++++++++++++++++++++--------------
  1 files changed, 31 insertions(+), 16 deletions(-)
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7851#comment:3>
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