[GHC] #11376: Inconsistent specified type variables among functions and datatypes/classes when using -XTypeApplications

[GHC]

#11376: Inconsistent specified type variables among functions and datatypes/classes
when using -XTypeApplications
-------------------------------------+-------------------------------------
        Reporter:  RyanGlScott       |                Owner:  goldfire
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.1
  checker)                           |             Keywords:
      Resolution:                    |  TypeApplications
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Comment (by simonpj):

 Hang on.  Isn't there already somewhere in VTA where you already
 instantiate where it's not strictly necessary?  Maybe somewhere like
 {{{
 f x = g
 }}}
 where `g` has a polytype. With lazy instantiation you might well get an
 inferred type
 {{{
 f :: forall a. Eq a => a -> forall b. Ord b => blah
 }}}
 but I think we don't.

 I think there is somewhere this happens, although I am not sure where.

 The `:t` context looks to me like another place where this eager
 instantiation should happen, no?

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11376#comment:18>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler