DeriveFunctor and PolyKinds
A tiny infelicity:
{-# LANGUAGE DeriveFunctor #-}
data A a = A deriving Functor
works only if PolyKinds
is disabled, otherwise it reports that A
has kind k -> *
instead of expected * -> *
. On the other hand, standalone deriving works fine.
Trac metadata
Trac field | Value |
---|---|
Version | 7.6.3 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | low |
Resolution | Unresolved |
Component | Compiler (Type checker) |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |