[GHC] #10963: Beginner-targeted language extension

[GHC]

#10963: Beginner-targeted language extension
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        Reporter:  kanetw            |                Owner:
            Type:  feature request   |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2136
       Wiki Page:                    |
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Comment (by simonpj):

 I'm anxious about having ''three'' forms of `:type`.  That seems jolly
 confusing to me.  It's bad enough having `:info` as well as `:type`, but
 there are good reasons for that.  But I'd rather not make matters worse.

 Suggestion:

 * Always do defaulting with `:type`.  That means the `:type e` lines up
 with evaluating `e`.  (In other words, adopt your proposed behaviour for
 `:type`.)

 * You can always use `:info` if you want the most general type of an
 identifier.

 * I am very doubtful about the usefulness of `:type-spec`.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10963#comment:5>
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