[GHC] #10506: SourceNotes are not applied to all identifiers

[GHC]

#10506: SourceNotes are not applied to all identifiers
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        Reporter:  gridaphobe        |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.10.2
       Component:  Compiler          |                 Version:  7.10.1
      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 simonpj):

 This tick stuff is clearly interesting and useful, but it is serving
 several masters, which are expressed by `CoreSyn.Tickish`:
  * `HpcTick`: HPC code coverage
  * `ProfNote`: cost-centre profiling
  * `Breakpoint`: breakpoint debugging
  * `SourceNote`: do not get in the way of optimisation, but help with
 debugging via DWARF.

 They differ in the extent to which they interfere with optimisation.  You
 probably want either `SourceNote` or `HpcTick` here; but I'm not sure
 which.  It depends on the semantics you expect during optimisation.  I
 suspect you want `SourceNote`.

 I hope you don't need a fifth one!

 Simon

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10506#comment:6>
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