Code demostrating "Distinguishing C++ Declarations from Expressions"

Code demostrating "Distinguishing C++ Declarations from Expressions" in?The Definitive ANTLR Reference.

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#include <stdio.h>typedef int I;char x = 'a';void foo() {  I(x);  x = 10;  printf("x = %d in foo\n", x);}struct _node {  int m;};typedef struct _node * T;T(*a)(int);int main(int argc, const char *argv[]) {  printf("cast %d, %d\n", I(x), (I)x);  foo();  printf("x = %d in main\n", x);   struct _node n;  T one = &n;  T *a = &one;  T(*a)->m = 8;  printf("m: %d\n", (*a)->m);  return 0;}