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  • #13909

Closed
Open
Opened Jul 01, 2017 by Ryan Scott@RyanGlScottMaintainer

Misleading error message when partially applying a data type with a visible quantifier in its kind

I'm not sure if this is a bug or an intended design, so I'll ask here. I want this program to typecheck:

{-# LANGUAGE TypeInType #-}
module Bug where

import Data.Kind

data Hm (k :: Type) (a :: k) :: Type

class HasName (a :: k) where
  getName :: proxy a -> String

instance HasName Hm where
  getName _ = "Hm"

This is rejected, however:

$ /opt/ghc/8.2.1/bin/ghci Bug.hs
GHCi, version 8.2.0.20170623: http://www.haskell.org/ghc/  :? for help
Loaded GHCi configuration from /home/ryanglscott/.ghci
[1 of 1] Compiling Bug              ( Bug.hs, interpreted )

Bug.hs:11:18: error:
    • Expecting two more arguments to ‘Hm’
      Expected kind ‘k0’, but ‘Hm’ has kind ‘forall k -> k -> *’
    • In the first argument of ‘HasName’, namely ‘Hm’
      In the instance declaration for ‘HasName Hm’
   |
11 | instance HasName Hm where
   |                  ^^

The culprit appears to be the fact that Hm has kind forall k -> k -> *, which uses a visible quantifier. Does this prevent partial applications of Hm? Or is this simply a GHC bug?

Trac metadata
Trac field Value
Version 8.0.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler (Type checker)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture
Edited Mar 10, 2019 by Ryan Scott
Assignee
Assign to
8.4.1
Milestone
8.4.1 (Past due)
Assign milestone
Time tracking
None
Due date
None
Reference: ghc/ghc#13909