ref: 641c1d29e085facb97071f64ff8a5953decbf82b
dir: /sys/src/libregexp/regerror.c/
#include <u.h>
#include <libc.h>
#include <regexp.h>
void
regerror(char *s)
{
	char buf[132];
	strcpy(buf, "regerror: ");
	strcat(buf, s);
	strcat(buf, "\n");
	write(2, buf, strlen(buf));
	exits("regerr");
}