+extern const source_position_t builtin_source_position;
+
+typedef struct token_base_t token_base_t;
+typedef struct identifier_t identifier_t;
+typedef struct string_literal_t string_literal_t;
+typedef struct number_literal_t number_literal_t;
+typedef union token_t token_t;
+
+struct token_base_t {
+ unsigned kind;
+ source_position_t source_position;
+};
+
+struct identifier_t {
+ token_base_t base;
+ symbol_t *symbol;
+};
+
+struct string_literal_t {
+ token_base_t base;
+ string_t string;
+};
+
+struct number_literal_t {
+ token_base_t base;
+ string_t number;
+ string_t suffix;
+};