I’m running GHC 6.4 on Windows XP
Professional. In GHCi, I try to load the following source file (also attached
as Bad.hs)
module Paper where
data Hash = Sha256 String
class HasHash
where hasHash :: HasHash -> Hash
and I get the following panic.
___ ___ _
/ _ \ /\ /\/ __(_)
/ /_\// /_/ / / | | GHC Interactive, version 6.4, for
Haskell 98.
/ /_\\/ __ / /___| | http://www.haskell.org/ghc/
\____/\/ /_/\____/|_| Type :? for help.
Loading package base-1.0 ... linking ... done.
Prelude> :cd Policy
Prelude> :load Bad
Compiling Paper ( Bad.hs, interpreted )
ghc.exe: panic! (the `impossible' happened, GHC version 6.4):
ds_app_type Paper.HasHash{tc r2vG} []
Please report it as a compiler bug to glasgow-haskell-bugs@xxxxxxxxxxx,
or http://sourceforge.net/projects/ghc/.
>
My typo is obvious, of course, but I
thought I’d report the panic as requested.
Cheers,
John
