DeriveAnyClass + deriving Bifunctor causes GHC panic
Attempting the derive Bifunctor with DeriveAnyClass caused this message from GHC:
$ ghc Foo.hs
[1 of 1] Compiling Foo ( Foo.hs, Foo.o )
Var/Type length mismatch:
[a_an7, b_an8]
[]
Var/Type length mismatch:
[a_an7, b_an8]
[]
Var/Type length mismatch:
[a_an7, b_an8]
[]
Foo.hs:8:13:ghc: panic! (the 'impossible' happened)
(GHC version 7.10.2 for x86_64-apple-darwin):
tcTyVarDetails a_an7
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
The code:
{-# LANGUAGE DeriveAnyClass #-}
module Foo where
import Data.Bifunctor
data Blah a b = A a | B b
deriving (Bifunctor)
Trac metadata
Trac field | Value |
---|---|
Version | 7.10.2 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | MacOS X |
Architecture |