Here is my code snippet:

#include <stdlib.h>
#include <stdio.h>

typedef struct node
{
    char key;          // value
    struct node *next; // pointer to the next element
} Node;

int main(void)
{
    Node *n = malloc(sizeof(Node));
    n->key = 'K';
    n->next = NULL;

    free(n);

    printf("%c\n", n->key);
}

When the above snippet is compiled and run...

ganningxu@Gannings-Computer:~/test$ gcc test_faults.c -o test_faults; ./test_faults
K

ganningxu@Gannings-Computer:~/test$ clang test_faults.c -o test_faults; ./test_faults
K

There are no compiler warnings or errors when the freed memory is accessed. Is there any way to force the compiler to show such errors?