enable match_default_bindings feature

Author: nikomatsakis

src/librustc/lib.rs

@@ -49,6 +49,7 @@
 #![feature(inclusive_range_syntax)]
 #![cfg_attr(windows, feature(libc))]
 #![feature(macro_vis_matcher)]
+#![feature(match_default_bindings)]
 #![feature(never_type)]
 #![feature(nonzero)]
 #![feature(quote)]

src/librustc_mir/lib.rs

@@ -21,6 +21,7 @@ Rust MIR: a lowered representation of Rust. Also: an experiment!
 #![feature(conservative_impl_trait)]
 #![feature(const_fn)]
 #![feature(i128_type)]
+#![feature(match_default_bindings)]
 #![feature(rustc_diagnostic_macros)]
 #![feature(placement_in_syntax)]
 #![feature(collection_placement)]