James McCoy wrote:

> > Patch 8.2.2389
> > Problem:    Test failure on a few systems.
> > Solution:   Avoid that "char" value is negative.
> > Files:      src/vim9compile.c, src/vim9execute.c, src/vim9.h
> >
> >
> > *** ../vim-8.2.2388/src/vim9compile.c   2021-01-21 20:21:24.240670466 +0100
> > --- src/vim9compile.c   2021-01-21 22:51:00.019353529 +0100
> > ***************
> > *** 826,832 ****
> >       if ((isn = generate_instr(cctx, ISN_CHECKTYPE)) == NULL)
> >         return FAIL;
> >       isn->isn_arg.type.ct_type = alloc_type(expected);
> > !     isn->isn_arg.type.ct_off = offset;
> >       isn->isn_arg.type.ct_arg_idx = argidx;
> >
> >       // type becomes expected
> > --- 826,834 ----
> >       if ((isn = generate_instr(cctx, ISN_CHECKTYPE)) == NULL)
> >         return FAIL;
> >       isn->isn_arg.type.ct_type = alloc_type(expected);
> > !     // Use the negated offset so that it's always positive.  Some
> > systems don't
> > !     // support negative numbers for "char".
> > !     isn->isn_arg.type.ct_off = (char)-offset;
> >
> 
> Or is it that whether char is signed or not depends on the system?  There's
> an int8_T typedef in Vim just for this type of code.

Forgot about that.  Let's change it, the positive offset is a bit weird.

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