Why can't we have a two storage with a single variable

I wrote code with two storage class with a single variable. test result show that we can't we have a two storage with a single variable. anyone can explain Why can't we have a two storage with a single variable

Code:

---

#include <stdio.h>

void fun ()
{
        static extern x = 0;
        x++;
        printf(" x = %d ", x);
}
int main()
{
    fun();
        return 0;
}

---

Test result

Code:

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  multiple storage classes in declaration specifiers  static extern x = 0;
  ^~~~~~

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Why would you expect that to make any more sense than say
int float two_types;

Because those are the rules.

The storage classes are mutually exclusive. For example, static means "cannot be seen from outside" (among other things), while extern means "can be seen from outside." So having something be both static and extern makes no sense - either it can be seen, or it cannot be seen.