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  • Glasgow Haskell Compiler
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  • #7901
Closed
Open
Created May 09, 2013 by exbb2@trac-exbb2

Bad error message when using UnicodeSyntax ∀ without ExplicitForall

This code

{-# LANGUAGE UnicodeSyntax #-}

id' :: ∀ a. a → a
id' a = a

produces following error

/tmp/id.hs:4:8: parse error on input `∀'

However, equivalent code without unicode syntax gives a much better error message:

id' :: forall a. a → a
id' a = a
/tmp/id.hs:4:16:
    Illegal symbol '.' in type
    Perhaps you intended -XRankNTypes or similar flag
    to enable explicit-forall syntax: forall <tvs>. <type>
Trac metadata
Trac field Value
Version 7.6.2
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
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