[GHC] #12093: Wrong argument count in error message with TypeApplications

GHC ghc-devs at haskell.org
Sat May 26 13:57:24 UTC 2018


#12093: Wrong argument count in error message with TypeApplications
-------------------------------------+-------------------------------------
        Reporter:  kwf               |                Owner:  (none)
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.0.1
  checker)                           |             Keywords:
      Resolution:  duplicate         |  TypeApplications
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13902            |  Differential Rev(s):
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by RyanGlScott):

 * status:  new => closed
 * resolution:   => duplicate
 * related:   => #13902


Comment:

 This was fixed in #13902. The error message now reads:

 {{{
 Bug.hs:5:9: error:
     • Couldn't match expected type ‘Bool -> t’ with actual type ‘Bool’
     • The expression ‘id @Bool’ is applied to two arguments,
       but its type ‘Bool -> Bool’ has only one
       In the expression: id @Bool True False
       In an equation for ‘wrong’: wrong = id @Bool True False
     • Relevant bindings include wrong :: t (bound at Bug.hs:5:1)
   |
 5 | wrong = id @Bool True False
   |         ^^^^^^^^^^^^^^^^^^^
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12093#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler


More information about the ghc-tickets mailing list