[GHC] #15674: GADT's displayed type is misleading

[GHC]

#15674: GADT's displayed type is misleading
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        Reporter:  AntC              |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.6.1-beta1
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:  x86_64
 Type of failure:  Poor/confusing    |  (amd64)
  error message                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 `:type <expr>` tells you the type of the expression `<expr>`, where
 `<expr>` can be any old expression, not just a single identifier.

 On the other hand `:info <name>` gives you information about the
 declaration of the entity `<name>`.  And indeed `:info MkDF`, `:info MkDG`
 and `:info MkDG2` give you the info that I think you want.   This works if
 the constructors are imported from a library that you can't (easily) see.

 Does that help?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15674#comment:1>
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