typedef struct AST_Node AST_Node;
typedef struct Expr Expr;

typedef enum AST_Kind{
  AK_None,
  AK_Undefined,
  
  AK_BaseType,
  AK_Typedef,
  AK_Enum,
  AK_Struct,
  AK_Union,
  
  AK_Note,
  AK_List,
  
  AK_Pointer,
  AK_Array,
  AK_Function,
  AK_Variable,
  AK_EnumChild,
  
}AST_Kind;

struct AST_Node{
  AST_Kind kind;
  Token *pos;
  Expr *expr;
  Intern_String name;
  
  AST_Node *next;
  AST_Node *scope_next;
  
  AST_Node *first_note;
  AST_Node *last_note;
  
  AST_Node *first_child;
  AST_Node *last_child;
  union{
    AST_Node *pointer;
    SizeU base_type_size;
    AST_Node *typedef_type;
    AST_Node *func_return_type;
  };
};

function B32
ast_is_type(AST_Node *n){
  B32 result = n->kind >= AK_BaseType && n->kind <= AK_Union;
  return result;
}