[GHC] #13839: GHC warnings do not respect the default module header

[GHC]

#13839: GHC warnings do not respect the default module header
-------------------------------------+-------------------------------------
        Reporter:  Feuerbach         |                Owner:  (none)
            Type:  bug               |               Status:  infoneeded
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by RolandSenn):

 * cc: RolandSenn (added)
 * status:  new => infoneeded


Comment:

 @Feuerbach: Can you still reproduce this?

 With ''cat T13869.hs''

 {{{#!hs
 type T = Int

 main :: IO ()
 main = return ()
 }}}

 ''ghc --version && ghc -Wall T13893.hs'' I get


 {{{
 The Glorious Glasgow Haskell Compilation System, version 8.6.2
 [1 of 1] Compiling Main             ( T13893.hs, T13893.o )

 T13893.hs:1:1: warning: [-Wunused-top-binds]
     Defined but not used: type constructor or class ‘T’
   |
 1 | type T = Int
   | ^^^^^^^^^^^^
 Linking T13893 ...
 }}}

 Even with GHC 8.0.1 I'm unable to reproduce your problem!

 How did you compile your program? What's your OS?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13839#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler