[GHC] #9173: Better type error messages

GHC ghc-devs at haskell.org
Sat Nov 21 12:33:41 UTC 2015


#9173: Better type error messages
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        Reporter:  simonpj           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.8.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by thomie):

 Again discussed in this thread:
 https://www.reddit.com/r/haskell/comments/3tm3lv/proposal_expectedactual_requiredfound/

 Not much new. `expected/found` instead of `expected/actual` seems a
 popular choice.

 I vote for switching the order as well, mentioning the word "context", and
 perhaps omitting the word `actual`. Something like this:
 {{{
 Couldn't match type ‘Char’ with type ‘Bool’ expected from context.
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9173#comment:15>
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