Abstract closed type families don't work with Backpack
This should typecheck:
{-# LANGUAGE TypeFamilies #-}
unit p where
module A where
type family ClosedFam a where
ClosedFam a = Int
unit sig where
signature A where
type family ClosedFam a where ..
unit main where
dependency sig[A=p:A]
but instead we confusingly report:
foo.bkp:9:9: error:
Type constructor ‘ClosedFam’ has conflicting definitions in the module
and its hsig file
Main module: type family ClosedFam a :: *
Hsig file: type family ClosedFam a :: *
Trac metadata
Trac field | Value |
---|---|
Version | 8.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler (Type checker) |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | |
Architecture |