ghci cause panic on 8.0.1
The following code panics when called with ghci:
module Foo where
import GHC.TypeLits (Symbol)
import Unsafe.Coerce
instance Read Symbol where
readsPrec = unsafeCoerce (readsPrec :: Int -> ReadS String)
data Bar = TyCon !Symbol deriving (Read)
% ghci foo.hs
GHCi, version 8.0.1: http://www.haskell.org/ghc/ :? for help
Loaded GHCi configuration from /home/zv/.ghc/ghci.conf
[1 of 1] Compiling Foo ( foo.hs, interpreted )
ghc: panic! (the 'impossible' happened)
(GHC version 8.0.1 for x86_64-unknown-linux):
atomPrimRep case a1_s2AG of _ [Occ=Dead] { }
Trac metadata
Trac field | Value |
---|---|
Version | 8.0.1 |
Type | Bug |
TypeOfFailure | OtherFailure |
Priority | normal |
Resolution | Unresolved |
Component | Compiler |
Test case | |
Differential revisions | |
BlockedBy | |
Related | |
Blocking | |
CC | |
Operating system | Unknown/Multiple |
Architecture |