[GHC] #3191: hpc reports spurious results with .lhs files even after processing with ghc -E

[GHC]

#3191: hpc reports spurious results with .lhs files even after processing with ghc
-E
-------------------------------------+-------------------------------------
              Reporter:  dominic     |            Owner:  andy@…
                  Type:  bug         |           Status:  infoneeded
              Priority:  lowest      |        Milestone:  7.10.1
             Component:  Code        |          Version:  6.10.2
  Coverage                           |         Keywords:
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by thomie):

 * status:  new => infoneeded
 * failure:   => None/Unknown


Comment:

 I cannot reproduce your problem, or I don't understand the problem
 description.

 > Even if I run them through the pre-processor (ghc -E) they still don't
 work
 What doesn't work? Do you see an error message, or maybe nothing happens
 at all? What are you trying to do?

 Please attach a small test program + instructions that demonstrate your
 problem.

 Here are some things I tried (same result with 7.8.3 as with 6.12.3):
 {{{
 $ cat test.lhs
 > main = print "ok"

 $ ghc -E test.lhs

 $ cat test.hspp                    # The 2 inserted lines you mention
 {-# LINE 1 "test.lhs" #-}
 #line 1 "test.lhs"
   main = print "ok"

 $ ghc -fhpc -o test test.hspp

 $ ./test
 "ok"

 $ hpc report test
 100% expressions used (0/0)
 100% boolean coverage (0/0)
      100% guards (0/0)
      100% 'if' conditions (0/0)
      100% qualifiers (0/0)
 100% alternatives used (0/0)
 100% local declarations used (0/0)
 100% top-level declarations used (0/0)

 # Looks ok to me.
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/3191#comment:11>
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