#define ast_type_adopt(a, b) ast_type_adopt_impl((ast_expression*)(a), (ast_expression*)(b))
void ast_type_adopt_impl(ast_expression *self, const ast_expression *other);
void ast_type_to_string(ast_expression *e, char *buf, size_t bufsize);
#define ast_type_adopt(a, b) ast_type_adopt_impl((ast_expression*)(a), (ast_expression*)(b))
void ast_type_adopt_impl(ast_expression *self, const ast_expression *other);
void ast_type_to_string(ast_expression *e, char *buf, size_t bufsize);