[GHC] #8220: Macros / functions for source location

[GHC]

#8220: Macros / functions for source location
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        Reporter:  wojteknar         |            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      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by ezyang):

 You can do this using the C pre-processor:

 {{{
 {-# LANGUAGE CPP #-}

 main = do
   print (__FILE__, __LINE__)
 }}}

 which is arguably the right place to do it. Is there any particular reason
 you want an ordinary function? A traditional function suffers from a
 severe modularity problem, because you can't use one of these functions in
 another function like "ASSERT"; it will report the line number of the
 assert definition and not the actual use-site of the assert; a pre-
 processor macro does not have this problem.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8220#comment:1>
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