[GHC] #1441: Evaluating undefined should return line number and module of location of undefined

[GHC]

#1441: Evaluating undefined should return line number and module of location of
undefined
----------------------------------+-----------------------------------------
    Reporter:  iampure at gmail.com  |        Owner:         
        Type:  feature request    |       Status:  new    
    Priority:  normal             |    Milestone:  6.8    
   Component:  Compiler           |      Version:  6.6.1  
    Severity:  normal             |   Resolution:         
    Keywords:                     |   Difficulty:  Unknown
          Os:  Unknown            |     Testcase:         
Architecture:  Unknown            |  
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Changes (by igloo):

  * milestone:  => 6.8

Comment:

 The problem is that it's hard to do in a non-adhoc fashion. You can't just
 define
 {{{
 undefined :: a
 undefined = "Undefined in " ++ magicIn ++ " at " ++ magicLocation
 }}}
 as that will just tell you something like "Undefined in undefined at
 GHC.Base line 15".

 You can hack it up with CPP's __LINE__, but that's a bit nasty.

 It would be possible to have a Template Haskell function that you'd use
 like
 {{{
 foo _ = $mkUndefined
 }}}
 except it doesn't look like we currently have a TH primitive to get the
 splice lication.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1441>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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