Adding parentheses introduces type error

{-# LANGUAGE RankNTypes #-}

module Test where

foo :: () -> forall b. b
foo = undefined

works = id foo

fails = (id) foo

-- works type checks, but fails fails with the following error
-- message:
--
--   Cannot match a monotype with `() -> forall b. b'
--   Probable cause: `foo' is applied to too few arguments
--   In the first argument of `(id)', namely `foo'
--   In the expression: (id) foo

Trac metadata

Trac field	Value
Version	6.12.3
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler (Type checker)
Test case
Differential revisions
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CC	nad
Operating system
Architecture