diff --git a/src/doc/book/casting-between-types.md b/src/doc/book/casting-between-types.md
index e2b114b7e54b4..2339fe60bf00b 100644
--- a/src/doc/book/casting-between-types.md
+++ b/src/doc/book/casting-between-types.md
@@ -49,13 +49,6 @@ expression, `e as U2` is not necessarily so (in fact it will only be valid if
 
 A cast `e as U` is valid if `e` has type `T` and `T` *coerces* to `U`.
 
-For example:
-
-```rust
-let a = "hello";
-let b = a as String;
-```
-
 ## Numeric casts
 
 A cast `e as U` is also valid in any of the following cases: