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  • Glasgow Haskell Compiler
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  • #11452

Closed
Open
Opened Jan 18, 2016 by Richard Eisenberg@raeDeveloper

Typed Template Haskell sneakily allows impredicativity

The following module is accepted:

{-# LANGUAGE ExplicitForAll, TemplateHaskell #-}

module Bug where

impred :: forall a. a -> a
impred = $$( [|| \x -> x ||] )

But that requires an intermediate TExp (forall a. a -> a).

Will fix in ongoing work.

Trac metadata
Trac field Value
Version 8.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture
Assignee
Assign to
8.0.1
Milestone
8.0.1 (Past due)
Assign milestone
Time tracking
None
Due date
None
Reference: ghc/ghc#11452