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Re: ghci and unboxed ints: msg#00004

lang.haskell.glasgow.bugs

Subject: Re: ghci and unboxed ints

dons:
> josefs:
> > Hi,
> >
> > I just played randomly with ghci for a while and encountered the following
> > rather odd behaviour:
> >
> > Prelude> :m GHC.Base
> > Prelude GHC.Base> let a = 1# +# 2#
> > Prelude GHC.Base> show (I# a)
> > "18345984"
> >
> > The number shown is the one I got when running on Solaris. I get a
> > different one when running on Windows. It doesn't matter which numbers I
> > add, the same number is always shown.
> >
> > Reproducible with 6.2 and 6.2.1.
>
> I don't know what the issue is, but it is interesting:
>
> Prelude> :m GHC.Base
> Prelude GHC.Base> case 1# +# 2# of a -> show (I# a)
> "3"
> Prelude GHC.Base> let a = 1# +# 2#
> Prelude GHC.Base> show (I# a)
> "1085417808"
>
> $ ghci --version
> The Glorious Glasgow Haskell Compilation System, version 6.3.20040202

And, just for fun (since I don't know enough ghci to help):

$ ghci --version
The Glorious Glasgow Haskell Compilation System, version 6.2

$ uname -msr
Linux 2.6.0-test9 ia64

Loading package base ... linking ... done.
Prelude> :m GHC.Base
Prelude GHC.Base> case 1# +# 2# of a -> show (I# a)
"3"
Prelude GHC.Base> let a = 1# +# 2#
Prelude GHC.Base> show (I# a)
zsh: segmentation fault ghci -fglasgow-exts

-- Don


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