GADT + impredicative polymorphism => stack overflow
The following makes the GHC 6.6 type checker loop/overflow:
{-# OPTIONS_GHC -fglasgow-exts #-}
data Foo a b where F :: a -> Foo () a
bar :: Foo () (forall a.a) -> ()
bar (F _) = ()
ghc yields stack overflow, as does ghci. Reloading in GHCi leads to an infinite loop.
Trac metadata
Trac field | Value |
---|---|
Version | 6.6 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler (Type checker) |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | Unknown |
Architecture | Unknown |