ModSim: assignment 2.7 does not free() all rabbits.

modsim/ass2/Makefile

 CC=clang
-CFLAGS=-Wall -Wextra -pedantic -std=c99 -D_GNU_SOURCE
+CFLAGS=-Wall -Wextra -pedantic -std=c99 -D_GNU_SOURCE -g
 LFLAGS=-lm
 
 all: q1 q2 q3 q4 q5 q7

modsim/ass2/q7.c

@@ -4,6 +4,7 @@
 
 #include <stdlib.h>
 #include <stdio.h>
+#include <assert.h>
 
 typedef struct rabbit {
     int age;
@@ -20,6 +21,7 @@ rabbit *rabbit_born() {
         rabbits->prev = r;
 
     r->age = 0;
+    r->prev = NULL;
     rabbits = r;
     rabbit_count++;
 
@@ -67,6 +69,7 @@ void sequence(int generations, int max_age) {
 
     puts("");
 
+    // This does not free() all rabbits
     while( rabbits )
         rabbit_die(&rabbits);
 }