add missing feature

RalfJung · RalfJung · commit 2f2f37983d14 · 2018-11-27T16:11:45.000+01:00
diff --git a/src/libstd/lib.rs b/src/libstd/lib.rs
@@ -310,6 +310,7 @@
 #![feature(panic_info_message)]
 #![feature(non_exhaustive)]
 #![feature(alloc_layout_extra)]
+#![feature(maybe_uninit)]
 
 #![default_lib_allocator]
 
