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From: Richard Stallman <rms@gnu.org>
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Subject: Re: xdisp.c problem?
Date: Fri, 31 Jan 2003 14:19:10 -0500
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    Ftext_properties_at(int 0x00000000, int 0x41942000) line 585 + 16 bytes
    get_char_property_and_overlay(int 0x00000000, int 0x112d38ac, int 0x0082f030, int * 0x00000000) line 688 + 12 bytes
    Fnext_single_char_property_change(int 0x00000000, int 0x112d38ac, int 0x11297404, int 0x000006f5) line 802

Which of these position arguments are valid buffer positions?
You need to compare them with the begv and zv fields in the
buffer object.