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-rw-r--r--src/libcore/iter/traits/collect.rs2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/libcore/iter/traits/collect.rs b/src/libcore/iter/traits/collect.rs
index 9f15de33425..015184cbba2 100644
--- a/src/libcore/iter/traits/collect.rs
+++ b/src/libcore/iter/traits/collect.rs
@@ -194,6 +194,8 @@ pub trait FromIterator<A>: Sized {
 /// `Item`:
 ///
 /// ```rust
+/// #![feature(associated_type_bounds)]
+///
 /// fn collect_as_strings<T>(collection: T) -> Vec<String>
 /// where
 ///     T: IntoIterator<Item: std::fmt::Debug>,