GHC 7.8 chokes on recursive classes
Type checking this makes GHC 7.8.3 loop:
{-# LANGUAGE MultiParamTypeClasses #-}
module Foo where
class Class3 a => Class1 a where
class Class2 t a where
class2 :: (Class3 t) => a -> m
class (Class1 t, Class2 t t) => Class3 t whereDoes not happen in 7.6.3.
I think it's something to do with the Class3 constraint appearing in class2.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.8.3 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler (Type checker) |
| Test case | |
| Differential revisions | |
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| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |