Remove orphaned unsigned_negation lint reference.

eefriedman · eefriedman · commit 312f886d03d7 · 2015-07-22T17:47:01.000-07:00
diff --git a/src/libstd/num/f32.rs b/src/libstd/num/f32.rs
@@ -14,7 +14,6 @@
 
 #![stable(feature = "rust1", since = "1.0.0")]
 #![allow(missing_docs)]
-#![allow(unsigned_negation)]
 
 use prelude::v1::*;
 
