Polykinded associated type family rejected on false pretenses
If I say
class HasRep a where
type Rep a :: TYPE r
I get
• Kind variable ‘r’ is implicitly bound in datatype
‘Rep’, but does not appear as the kind of any
of its type variables. Perhaps you meant
to bind it (with TypeInType) explicitly somewhere?
Type variables with inferred kinds: a
• In the class declaration for ‘HasRep’
This definition should be accepted, though, as r
is just an invisible parameter to the associated type family. (I don't know how useful this is, but it's not bogus.)
Trac metadata
Trac field | Value |
---|---|
Version | 8.0.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |