Associated type is accepted even without mentioning class parameters
The following module is accepted:
{-# LANGUAGE TypeFamilies #-}
module Bug where
class C a where
type F b
Note that the associate type family F
does not mention the class variable a
. Because associated type families are somewhat thin sugar over non-associated type families, I doubt this causes any great disaster anywhere, but it should probably be fixed.
Trac metadata
Trac field | Value |
---|---|
Version | 7.8.2 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | low |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |