Merge pull request #2574 from mark-i-m/i128

i128 is stabilizing

clippy_lints/src/lib.rs

@@ -2,8 +2,6 @@
 
 #![feature(box_syntax)]
 #![feature(custom_attribute)]
-#![feature(i128_type)]
-#![feature(i128)]
 #![feature(rustc_private)]
 #![feature(slice_patterns)]
 #![feature(stmt_expr_attributes)]
@@ -13,6 +11,10 @@
 #![allow(unknown_lints, indexing_slicing, shadow_reuse, missing_docs_in_private_items)]
 #![recursion_limit = "256"]
 
+// FIXME(mark-i-m) remove after i128 stablization merges
+#![allow(stable_features)]
+#![feature(i128, i128_type)]
+
 #[macro_use]
 extern crate rustc;
 extern crate rustc_typeck;