remove feature opt-ins that are no longer needed

diff --git a/src/lib.rs b/src/lib.rs
index d1d8e8cf229f66993176d48a1dbe1d7b9d566462..c55b4538005a3d6396a54586ac690f206ad756f8 100644 (file)
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,8 +1,5 @@
 #![feature(
-    btree_range,
-    collections,
     i128_type,
-    pub_restricted,
     rustc_private,
 )]