ghci and unboxed types

[Ralf Hinze]

Dear bug hunters,

ghci is unhappy with the attached module (stripped down version).

---

ralf/tmp> ghci -fglasgow-exts Arr.lhs
   ___         ___ _
  / _ \ /\  /\/ __(_)
 / /_\// /_/ / /  | |      GHC Interactive, version 5.04, for Haskell 98.
/ /_\\/ __  / /___| |      http://www.haskell.org/ghc/
\____/\/ /_/\____/|_|      Type :? for help.

Loading package base ... linking ... done.
Loading package haskell98 ... linking ... done.
Compiling Arr              ( Arr.lhs, interpreted )
ghc-5.04: panic! (the `impossible' happened, GHC version 5.04):
        ByteCodeGen.schemeE P_

Please report it as a compiler bug to glasgow-haskell-bugs at haskell.org,
or http://sourceforge.net/projects/ghc/.


> Leaving GHCi.
ralf/tmp> ghc -O2 -c -Wall -fglasgow-exts Arr.lhs

Arr.lhs:22:
    Warning: This binding for `s1#' shadows an existing binding

Arr.lhs:24:
    Warning: This binding for `s2#' shadows an existing binding

Arr.lhs:27:
    Warning: This binding for `s2#' shadows an existing binding
ralf/tmp> ghci -fglasgow-exts Arr.lhs
   ___         ___ _
  / _ \ /\  /\/ __(_)
 / /_\// /_/ / /  | |      GHC Interactive, version 5.04, for Haskell 98.
/ /_\\/ __  / /___| |      http://www.haskell.org/ghc/
\____/\/ /_/\____/|_|      Type :? for help.

Loading package base ... linking ... done.
Loading package haskell98 ... linking ... done.
Skipping  Arr              ( Arr.lhs, ./Arr.o )
Ok, modules loaded: Arr.
Prelude Arr>

---

However, ghci loads precompiled code so it's not a show stopper.

Cheers, Ralf
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