Google
 

Trailing-Edge - PDP-10 Archives - SRI_NIC_PERM_FS_1_19910112 - c/user/ncref/ibug.c
There are no other files named ibug.c in the archive.
char string[100];
parcase (j)
{	int js;
	js = j-2;
	if (string[js] == ' ')  js--;
	foo(js);
}