[Bug 193499] [tests] usr.bin/yacc/err_syntax27.error failures with the latest kyua

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193499

--- Comment #6 from Craig Rodrigues <rodrigc at FreeBSD.org> ---
I recompiled byacc without optimization, by doing:
make DEBUG_FLAGS="-g -O0".  Here is what I got from the backtrace.

(gdb) where
#0  0x00000000004134ed in copy_param (k=13) at
/builds/FreeBSD_HEAD/usr.bin/yacc/../../contrib/byacc/reader.c:681
#1  0x000000000040cf9d in read_declarations () at
/builds/FreeBSD_HEAD/usr.bin/yacc/../../contrib/byacc/reader.c:1359
#2  0x000000000040ce03 in reader () at
/builds/FreeBSD_HEAD/usr.bin/yacc/../../contrib/byacc/reader.c:3250
#3  0x0000000000405ed2 in main (argc=8, argv=0x7fffffffeb90) at
/builds/FreeBSD_HEAD/usr.bin/yacc/../../contrib/byacc/main.c:692
(gdb) frame 0
#0  0x00000000004134ed in copy_param (k=13) at
/builds/FreeBSD_HEAD/usr.bin/yacc/../../contrib/byacc/reader.c:681
681             buf[i] = (char)c;

(gdb) info locals
buf = 0x8010140f0 "int regs[26] \n", '¥' <repeats 83 times>, "int regs[26] \n",
'¥' <repeats 83 times>, "int re"...
c = -91
head = (param *) 0xffffffea00000000
p = (param *) 0x41241c
i = 4112144
name = -5424
type2 = 0

(gdb) frame 1
#1  0x000000000040cf9d in read_declarations () at
/builds/FreeBSD_HEAD/usr.bin/yacc/../../contrib/byacc/reader.c:1359
1359                copy_param(k);
(gdb) info locals
c = 37
k = 13

(gdb) frame 2
#2  0x000000000040ce03 in reader () at
/builds/FreeBSD_HEAD/usr.bin/yacc/../../contrib/byacc/reader.c:3250
3250        read_declarations();
(gdb) info locals
No locals.

(gdb) frame 3
#3  0x0000000000405ed2 in main (argc=8, argv=0x7fffffffeb90) at
/builds/FreeBSD_HEAD/usr.bin/yacc/../../contrib/byacc/main.c:692
692         reader();
(gdb) info locals
No locals.
(gdb) p argv[0]
$1 = 0x7fffffffedf8 "../yacc"
(gdb) p argv[1]
$2 = 0x7fffffffee00 "-v"
(gdb) p argv[2]
$3 = 0x7fffffffee03 "-d"
(gdb) p argv[3]
$4 = 0x7fffffffee06 "-p"
(gdb) p argv[4]
$5 = 0x7fffffffee09 "err_syntax27_"
(gdb) p argv[5]
$6 = 0x7fffffffee17 "-b"
(gdb) p argv[6]
$7 = 0x7fffffffee1a "test-err_syntax27"
(gdb) p argv[7]
$8 = 0x7fffffffee2c "./err_syntax27.y"
(gdb) p argv[8]
$9 = 0x0

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