Revert removed #![feature(nll)]

taiki-e · taiki-e · commit 7815c9b1c80c · 2019-02-08T19:56:52.000+09:00
diff --git a/src/librustc_mir/lib.rs b/src/librustc_mir/lib.rs
@@ -4,6 +4,7 @@ Rust MIR: a lowered representation of Rust. Also: an experiment!
 
 */
 
+#![feature(nll)]
 #![feature(in_band_lifetimes)]
 #![feature(slice_patterns)]
 #![feature(slice_sort_by_cached_key)]
