Add ignore to doc code

diff --git a/src/doc/unstable-book/src/library-features/fnbox.md b/src/doc/unstable-book/src/library-features/fnbox.md
index 16ebab3abeb501ac006f76a7bc626ad185f15d2b..cb3386b7152112a5953d457b12c36c181f061618 100644 (file)
--- a/src/doc/unstable-book/src/library-features/fnbox.md
+++ b/src/doc/unstable-book/src/library-features/fnbox.md
@@ -8,7 +8,7 @@ The tracking issue for this feature is [#28796]
 
 This had been a temporary alternative to the following impls:
 
-```rust
+```rust,ignore
 impl<A, F> FnOnce for Box<F> where F: FnOnce<A> + ?Sized {}
 impl<A, F> FnMut for Box<F> where F: FnMut<A> + ?Sized {}
 impl<A, F> Fn for Box<F> where F: Fn<A> + ?Sized {}
@@ -16,7 +16,7 @@ impl<A, F> Fn for Box<F> where F: Fn<A> + ?Sized {}
 
 The impls are parallel to these (relatively old) impls:
 
-```rust
+```rust,ignore
 impl<A, F> FnOnce for &mut F where F: FnMut<A> + ?Sized {}
 impl<A, F> FnMut for &mut F where F: FnMut<A> + ?Sized {}
 impl<A, F> Fn for &mut F where F: Fn<A> + ?Sized {}