typedef struct atom {
  int element;
  struct atom *next;
};
int main(){
   atom *n;
}

Line 4: warning: useless storage class specifier in empty declaration
In function 'main':
Line 6: error: 'atom' undeclared (first use in this function)
Line 6: error: (Each undeclared identifier is reported only once
Line 6: error: for each function it appears in.)
Line 6: error: 'n' undeclared (first use in this function)