[m-rev.] for review: fix bug #158

[Zoltan Somogyi]

On 19-Aug-2010, Peter Wang <novalazy at gmail.com> wrote:
> When a foreign_proc output variable of type `char' is assigned to an
> MR_Word variable, it must first be cast to an MR_UnsignedChar to prevent
> sign-extension of 8-bit character values.  This was documented in
> mercury_string.h.

That is fine. Thanks Peter.

Zoltan.
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