[GHC] #9946: Expose the source location of template-haskell Names

[GHC]

#9946: Expose the source location of template-haskell Names
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        Reporter:  gridaphobe        |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  low               |               Milestone:
       Component:  Compiler          |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by gridaphobe):

 Spec: Add a single function

 {{{
 nameSrcLoc :: TH.Name -> GHC.SrcLoc.SrcLoc
 }}}
 using the upcoming `SrcLoc` type from
 [https://phabricator.haskell.org/D578 D578], which returns the span of the
 whole definition, e.g.

 {{{
 module A where

 head :: [a] -> a
 head [] = undefined
 head (x:_) = x
 }}}

 {{{
 module B where

 loc = nameLoc 'A.head
   -- loc == A.hs:3:1-5:15
 }}}

 This provides maximal information, and my intuition is that it might be
 easier for clients to narrow the span (e.g. to the first equation) if
 needed than to widen it.

 But, as above, I've only ever needed the filepath in practice, so I'm very
 open to convincing that a different span would be more useful.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9946#comment:2>
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