============================================
Struct declarations
============================================

struct s1;

struct s2 {
  int x;
  float y;
};

---

(program
  (struct_declaration (struct_type (identifier)))
  (struct_declaration (struct_type (identifier)
    (field (identifier) (identifier))
    (field (identifier) (identifier)))))

============================================
Union declarations
============================================

union u1;

union s2 {
  int x;
  float y;
};

---

(program
  (union_declaration (union_type (identifier)))
  (union_declaration (union_type (identifier)
    (field (identifier) (identifier))
    (field (identifier) (identifier)))))

============================================
Enum declarations
============================================

enum e1;

enum e2 {
  val1,
  val2 = 5,
  val3
};

---

(program
  (enum_declaration (enum_type (identifier)))
  (enum_declaration (enum_type (identifier)
    (identifier)
    (enum_value (identifier) (number))
    (identifier))))

============================================
Primitive-typed variable declarations
============================================

unsigned short int a;
long int b;
float d, e;

---

(program
  (var_declaration (primitive_type (identifier)) (identifier))
  (var_declaration (primitive_type (identifier)) (identifier))
  (var_declaration (identifier) (identifier) (identifier)))

============================================
Composite-typed variable declarations
============================================

struct b c;
union { int e; } f;
enum { g, h } i;

---

(program
  (var_declaration (struct_type (identifier)) (identifier))
  (var_declaration (union_type (field (identifier) (identifier))) (identifier))
  (var_declaration (enum_type (identifier) (identifier)) (identifier)))

============================================
Pointer variable declarations
============================================

char *the_string;
const char **the_strings;

---

(program
  (var_declaration (identifier) (pointer_type (identifier)))
  (var_declaration (type (identifier))
    (pointer_type (pointer_type (identifier)))))

============================================
Typedefs
============================================

typedef int my_int;

---

(program
  (typedef (identifier) (identifier)))

============================================
Function declarations
============================================

int main(int argc, const char **argv);

---

(program (function_declaration
  (identifier)
  (identifier)
  (formal_parameters
    (field (identifier) (identifier))
    (field (type (identifier)) (pointer_type (pointer_type (identifier)))))))