[GHC] #11208: GHCi doesn't qualify types anymore

[GHC]

#11208: GHCi doesn't qualify types anymore
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        Reporter:  hvr               |                Owner:
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.0.1
       Component:  GHCi              |              Version:  7.11
      Resolution:                    |             Keywords:  regression
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 I'm sorry about that.  For the benefit of other readers, GHCi tries to
 print types that make sense in the lexical scope of the REPL (i.e. the
 interactive context). If a type needs to be qualified, GHC will qualify it
 when printing it out.

 But in the commit hvr points to in comment:3, I gave the pacakges `ghc-
 prim`, `base` and `template-haskell` special behaviour, and are printed
 unqualified.

 How bad is that?  Does tooling really parse error messages?  (If so there
 should be a Better Way!)

 My motivation, as explained in the commit, was to avoid printing a
 heavily-qualified `Constraint` when giving kind signatures.  But maybe
 there is a better way to do that?

 I'd be happy with an agreed design change here. As the commit says, it's a
 bit arbitrary as it stands.

 Simon

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11208#comment:4>
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