Put back feature

src/lib.rs

@@ -17,6 +17,7 @@
 #![feature(linkage)]
 #![feature(lang_items)]
 #![allow(unused_features)]
+#![feature(i128_type)]
 #![no_builtins]
 #![cfg_attr(feature = "compiler-builtins", feature(staged_api))]
 #![cfg_attr(feature = "compiler-builtins",