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-rw-r--r--src/libnum/lib.rs3
1 files changed, 1 insertions, 2 deletions
diff --git a/src/libnum/lib.rs b/src/libnum/lib.rs
index fa41cf37112..17071d22dee 100644
--- a/src/libnum/lib.rs
+++ b/src/libnum/lib.rs
@@ -43,8 +43,7 @@
 //!
 //! [newt]: https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method
 
-#![allow(unknown_features)]
-#![feature(macro_rules, slicing_syntax)]
+#![feature(macro_rules)]
 #![feature(default_type_params)]
 
 #![crate_name = "num"]