bool ast_compare_type(ast_expression *a, ast_expression *b);
ast_expression* ast_type_copy(lex_ctx ctx, const ast_expression *ex);
#define ast_type_adopt(a, b) ast_type_adopt_impl((ast_expression*)(a), (ast_expression*)(b))
bool ast_compare_type(ast_expression *a, ast_expression *b);
ast_expression* ast_type_copy(lex_ctx ctx, const ast_expression *ex);
#define ast_type_adopt(a, b) ast_type_adopt_impl((ast_expression*)(a), (ast_expression*)(b))