#3422: No match in record selector Var.tcTyVarDetails
--------------------------------------------+-------------------------------
Reporter: guest | Owner: chak
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.10.4
Severity: normal | Resolution:
Keywords: deriving instance, type family | Testcase:
Os: Linux | Architecture: x86
--------------------------------------------+-------------------------------
Changes (by chak):
* owner: => chak
Comment:
{{{
{-# OPTIONS_GHC -fglasgow-exts #-}
{-# LANGUAGE UndecidableInstances #-}
module GHCBug where
newtype Trie m k a = Trie (Maybe a, m (SubKey k) (Trie m k a))
type family SubKey k
type instance SubKey [k] = k
deriving instance (Eq (m k (Trie m [k] a))
,Eq a) => Eq (Trie m [k] a)
{-
[...@monire ~]$ ghc -O2 -c --make GHCBug.hs
[1 of 1] Compiling GHCBug ( GHCBug.hs, GHCBug.o )
ghc: panic! (the 'impossible' happened)
(GHC version 6.10.3 for x86_64-unknown-linux):
No match in record selector Var.tcTyVarDetails
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
-}
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3422#comment:1>
GHC <http://www.haskell.org/ghc/>
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