Re: [bug-gawk] $0 reassignment corruption in 4.2

[Andrew J. Schorr]

I think this simple test case demonstrates the problem. The assertion
fails, at least:

bash-4.2$ cat /tmp/test.awk
function reassign(x, y) {
   $0 = x
   print y
}

{
   reassign("larry", $1)
}

bash-4.2$ echo hello | gawk -f /tmp/test.awk
debug $0: flags MALLOC|STRING|STRCUR stptr 0x2233530 stlen 5 string [larry] 
valref 3
debug $1: flags STRING|STRCUR|USER_INPUT stptr 0x2239710 stlen 5 string [hello] 
valref 2
gawk: field.c:357: purge_record: Assertion `(fields_arr[i]->flags & 0x0001) == 
0 ? fields_arr[i]->sub.val.sref == 1 : 1' failed.
Aborted (core dumped)

(I added those first 2 debug statements to field.c:purge_record.)

The test code is attached. I hope that fixing this may fix the big
mdlint test case. But I don't have a patch yet. Any takers?

Regards,
Andy

test.awk
Description: Text document