From: Brian Candler <B.Candler@...>
Date: 2003-07-03T19:00:21+09:00
Subject: Re: More error backtrace

On Thu, Jul 03, 2003 at 08:39:26AM +0900, Hal E. Fulton wrote:
> > Just curious, what's the rationale for truncating it?
> 
> I always assumed it was to save space. Does it
> do it when the levels are unique?

No, at least not in 1.6.8:

#define TRACE_MAX (TRACE_HEAD+TRACE_TAIL+5)
#define TRACE_HEAD 8
#define TRACE_TAIL 5

        ep = RARRAY(errat);
        for (i=1; i<ep->len; i++) {
            if (TYPE(ep->ptr[i]) == T_STRING) {
                fprintf(stderr, "\tfrom %s\n", RSTRING(ep->ptr[i])->ptr);
            }
            if (i == TRACE_HEAD && ep->len > TRACE_MAX) {
                fprintf(stderr, "\t ... %ld levels...\n",
                        ep->len - TRACE_HEAD - TRACE_TAIL);
                i = ep->len - TRACE_TAIL;
            }
        }
    }
}

i.e. it shows just the first 8 lines and the last 5 lines.

Cheers,

Brian.