/* --- Begin testcase.c --- */
#include <regex.h>
#include <sys/types.h>
int main (int argc, char **argv) {
    int err;
    regex_t preg;
    err = regcomp (&preg, "foo", REG_NOSUB);
    return 0;
}
/* --- End testcase.c --- */

$ gcc -Wall -o testcase testcase.c -lefence
$ ./testcase

  Electric Fence 2.2.0 Copyright (C) 1987-1999 Bruce Perens <bruce>

ElectricFence Aborting: Allocating 0 bytes, probably a bug.
Illegal instruction