[GHC] #960: Lexical call site string

[GHC]

#960: Lexical call site string
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 Reporter:  paul at cogito.org.uk  |          Owner:         
     Type:  feature request     |         Status:  new    
 Priority:  normal              |      Milestone:         
Component:  Compiler            |        Version:  6.6    
 Severity:  normal              |     Resolution:         
 Keywords:                      |     Difficulty:  Unknown
 Testcase:                      |   Architecture:  Unknown
       Os:  Unknown             |  
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Comment (by simonpj):

 Indeed ... and you want to see what called whatever called "head", and
 whatever called that, and so on.

 Often asked for, but I don't know how to do that without runtime overhead,
 passing extra arguments. That's more or less what -xc does.

 My suggestion is less ambitious but gets part way.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/960>
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