Don't ignore a doc code-block we can compile.

diff --git a/src/doc/book/traits.md b/src/doc/book/traits.md
index d07fb6b7c45bfb06a6beafa89f0f767499dee733..b0d954adf6771c9bacd8d3877d5dd57ef4abcd34 100644 (file)
--- a/src/doc/book/traits.md
+++ b/src/doc/book/traits.md
@@ -291,7 +291,7 @@ let result = f.write(buf);
 
 We need to `use` the `Write` trait first:
 
-```rust,ignore
+```rust,no_run
 use std::io::Write;
 
 let mut f = std::fs::File::create("foo.txt").expect("Couldn’t create foo.txt");