rollup merge of #20754: nikomatsakis/int-feature

Conflicts:
	src/test/compile-fail/borrowck-move-out-of-overloaded-auto-deref.rs
	src/test/compile-fail/issue-2590.rs
	src/test/compile-fail/lint-stability.rs
	src/test/compile-fail/slice-mut-2.rs
	src/test/compile-fail/std-uncopyable-atomics.rs

src/librustc_back/lib.rs

@@ -31,6 +31,7 @@
       html_root_url = "http://doc.rust-lang.org/nightly/")]
 #![allow(unknown_features)]
 #![feature(slicing_syntax, box_syntax)]
+#![allow(unknown_features)] #![feature(int_uint)]
 
 extern crate syntax;
 extern crate serialize;