Memory related mutation operators are not supported

[dmc1778]

Current release of mull does not support memory related mutation operators for C. A set of memory operators are:

1. removing null assignment statements

free (ptr);
ptr = NULL;

changes to

free (ptr);
ptr;

2. zero allocation fault

int ptr = malloc(10*sizeof(int)); >> int num = malloc (0);

changes to

int num = malloc (0);

3. replacing memory allocation with NULL

int ptr = malloc (4*sizeof(int)); >> int ptr = NULL;

changes to

int ptr = NULL;

4. removing free(ptr); statement to inject dangling pointer vulnerability

[AlexDenisov]

I'm not 100% sure about the first one, but the rest can definitely be implemented with Mull. I guess it makes sense to refer to the paper that proposes these operators: Mutation testing of memory-related operators (as pointed out by @nimashiri).