[GHC] #14273: Typed holes' "valid substitutions" suggestions are oblivious to type class constraints

[GHC]

#14273: Typed holes' "valid substitutions" suggestions are oblivious to type class
constraints
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        Reporter:  RyanGlScott       |                Owner:  Tritlo
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler (Type    |              Version:  8.3
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Poor/confusing    |  Unknown/Multiple
  error message                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9091, #9479      |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Tritlo):

 Replying to [comment:11 simonpj]:

 Thanks for the clarifications. I'll aim for making it work for the common
 cases then.

 Replying to [comment:12 vanto]:

 Well, they're (kind of) not on by default, you have to have a typed hole
 in your code for it to trigger. What other behaviour do you want when `_`
 is encountered in expressions?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14273#comment:13>
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