allow incomplete features for now

Author: fee1-dead

library/alloc/tests/lib.rs

@@ -25,6 +25,8 @@
 #![feature(string_remove_matches)]
 #![feature(const_btree_new)]
 #![feature(const_trait_impl)]
+// FIXME remove this when const_trait_impl is not incomplete anymore
+#![allow(incomplete_features)]
 
 use std::collections::hash_map::DefaultHasher;
 use std::hash::{Hash, Hasher};