[GHC] #14779: Compiling with -g fails -lint-core checks

[GHC]

#14779: Compiling with -g fails -lint-core checks
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        Reporter:  niteria           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.4.2
       Component:  Compiler          |              Version:  8.3
  (Debugging)                        |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14122, #14123,   |  Differential Rev(s):  phab:D4423
  #8472, #14406                      |
       Wiki Page:                    |
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Comment (by niteria):

 Fixing `tryForCSE` to look through ticks here:

 {{{
 tryForCSE :: Bool -> CSEnv -> InExpr -> OutExpr
 tryForCSE toplevel env expr
   | toplevel && exprIsLiteralString expr = expr
       -- See Note [Take care with literal strings]
   | Just e <- lookupCSEnv env expr'' = mkTicks ticks e
   | otherwise                        = expr'
 }}}

 Appears to take care of the problem from 2 previous comments.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14779#comment:21>
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