[GHC] #10704: Can't lookup fixities of infix types in Template Haskell

GHC ghc-devs at haskell.org
Tue Jul 28 21:41:28 UTC 2015


#10704: Can't lookup fixities of infix types in Template Haskell
-------------------------------------+-------------------------------------
        Reporter:  RyanGlScott       |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Template Haskell  |                 Version:  7.10.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by RyanGlScott):

 Sorry, I forgot to mention that I was using the HEAD version of GHCi, in
 which it does work (after fixing #10018):

 {{{
 $ inplace/bin/ghc-stage2 --interactive -XTypeOperators -XTypeFamilies
 -XMultiParamTypeClasses
 GHCi, version 7.11.20150727: http://www.haskell.org/ghc/  :? for help
 λ> class a :=> b; infixr 5 :=>
 λ> :i :=>
 class (:=>) a b         -- Defined at <interactive>:1:1
 infixr 5 :=>
 λ> type a :+: b = Either a b; infixr 5 :+:
 λ> :i :+:
 type (:+:) a b = Either a b     -- Defined at <interactive>:3:1
 infixr 5 :+:
 λ> type family a :*: b; infixr 5 :*:
 λ> :i :*:
 type family (:*:) a b :: *      -- Defined at <interactive>:5:1
 infixr 5 :*:
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10704#comment:2>
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