GHCi browse gets type families wrong
Reported by Luite Stegeman
--------- A.hs
module A where
import B
--------- B.hs
{-# LANGUAGE TypeFamilies #-}
module B where
import qualified C
data B1 a = B1 a
instance C.C1 (B1 a) where
data C.F (B1 a) = B2 a
data family D a
---------- C.hs
{-# LANGUAGE TypeFamilies #-}
module C where
class C1 a where
data F a :: *
Nnw use ghci 7.2.1:
ghci A
*A> :info F
data family F a -- Defined at C.hs:6:8
ghci B
*B> :browse
data B1 a = B1 a
data instance B.R:FB1 (B1 a) = B2 a
data family D a
data family F a
-- Why is F displayed here?
-- What is B.R:FB1?
*B> :info F
Top level: Not in scope: data constructor `F'
*B> :info C.F
data family C.F a -- Defined at C.hs:6:8
But with ghci 7.0.4:
ghci A
*A> :info F
Top level: Not in scope: data constructor `F'
Trac metadata
Trac field | Value |
---|---|
Version | 7.2.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | stegeman@gmail.com |
Operating system | |
Architecture |