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typedef struct _node *node;
struct _node {
char *val;
/*@null@*/ node next;
}
void node_free1 (/*@only@*/ node n)
{
free (n); /* 2 errors: must free n->next, n->val */
}
void node_free2 (/*@only@*/ node n)
{
node nn = n->next;
free (n); /* error: must free n->val */
} /* error - nn not released */
void node_free3 (/*@only@*/ node n)
{
node nn = n->next;
free (n->val);
free (n); /* okay */
if (nn != NULL) {
node_free1 (nn); /* okay (error for null) */
}
} /* okay */
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