[GHC] #13342: Core Lint warnings are emitted on stdout rather than stderr

[GHC]

#13342: Core Lint warnings are emitted on stdout rather than stderr
-------------------------------------+-------------------------------------
        Reporter:  mpickering        |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by mpickering):

 Here is an easy way to reproduce the problem. You need a compiler compiled
 with `-DDEBUG` (build flavour devel2 is easiest) and then

 `inplace/bin/ghc-stage2 -dcore-lint A.hs`

 {{{
 module A where

 f :: [()] -> [()]
 f (x:xs) = x : f xs

 {-# INLINE f #-}
 }}}

 {{{
 [1 of 1] Compiling A                ( cltest.hs, cltest.o )
 *** Core Lint warnings : in result of Occurrence analysis ***
 cltest.hs:4:1: warning:
     [RHS of f :: [()] -> [()]]
     INLINE binder is (non-rule) loop breaker: f

 *** Core Lint warnings : in result of Simplifier ***
 cltest.hs:4:1: warning:
     [RHS of f :: [()] -> [()]]
     INLINE binder is (non-rule) loop breaker: f

 *** Core Lint warnings : in result of Occurrence analysis ***
 cltest.hs:4:1: warning:
     [RHS of f :: [()] -> [()]]
     INLINE binder is (non-rule) loop breaker: f

 *** Core Lint warnings : in result of Simplifier ***
 cltest.hs:4:1: warning:
     [RHS of f :: [()] -> [()]]
     INLINE binder is (non-rule) loop breaker: f

 *** Core Lint warnings : in result of Tidy Core ***
 cltest.hs:4:1: warning:
     [RHS of f :: [()] -> [()]]
     INLINE binder is (non-rule) loop breaker: f

 *** Core Lint warnings : in result of CorePrep ***
 cltest.hs:4:1: warning:
     [RHS of f :: [()] -> [()]]
     INLINE binder is (non-rule) loop breaker: f
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13342#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler