X-Git-Url: https://git.lizzy.rs/?a=blobdiff_plain;f=library%2Fcore%2Fsrc%2Fascii.rs;h=532208e41afa2ba2b01169da64c061d0d5587347;hb=0610d4fa66f95fa3a4a7af86239976ed668bab0e;hp=0a456ee1eb2d59fde0ac9d7c2b56382ee0a1da1a;hpb=37f17bca7ccca0b393a58c87bb87bac18f371f61;p=rust.git

diff --git a/library/core/src/ascii.rs b/library/core/src/ascii.rs
index 0a456ee1eb2..532208e41af 100644
--- a/library/core/src/ascii.rs
+++ b/library/core/src/ascii.rs
@@ -18,6 +18,7 @@
 ///
 /// This `struct` is created by the [`escape_default`] function. See its
 /// documentation for more.
+#[must_use = "iterators are lazy and do nothing unless consumed"]
 #[stable(feature = "rust1", since = "1.0.0")]
 #[derive(Clone)]
 pub struct EscapeDefault {