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-rw-r--r--src/doc/book/custom-allocators.md1
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diff --git a/src/doc/book/custom-allocators.md b/src/doc/book/custom-allocators.md
index 6b19abc728c..65626c11462 100644
--- a/src/doc/book/custom-allocators.md
+++ b/src/doc/book/custom-allocators.md
@@ -83,7 +83,6 @@ annotated version of `alloc_system`
 // Allocators are not allowed to depend on the standard library which in turn
 // requires an allocator in order to avoid circular dependencies. This crate,
 // however, can use all of libcore.
-#![feature(no_std)]
 #![no_std]
 
 // Let's give a unique name to our custom allocator