#include <stdio.h>
int main(int argc, char *argv[])
{
    const char a[] = "Hello";
    const char *b = a;
    a = b;  /* Not allowed. */
    printf("%s\n", b);
    return 0;
}

In function 'main':
Line 6: error: assignment of read-only variable 'a'
Line 6: error: incompatible types in assignment