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diff --git a/src/test/ui/lint/unused/must_use-in-stdlib-traits.stderr b/src/test/ui/lint/unused/must_use-in-stdlib-traits.stderr
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+error: unused implementer of `Iterator` that must be used
+ --> $DIR/must_use-in-stdlib-traits.rs:42:4
+ |
+LL | iterator();
+ | ^^^^^^^^^^^
+ |
+note: the lint level is defined here
+ --> $DIR/must_use-in-stdlib-traits.rs:1:9
+ |
+LL | #![deny(unused_must_use)]
+ | ^^^^^^^^^^^^^^^
+ = note: iterators are lazy and do nothing unless consumed
+
+error: unused implementer of `Future` that must be used
+ --> $DIR/must_use-in-stdlib-traits.rs:43:4
+ |
+LL | future();
+ | ^^^^^^^^^
+ |
+ = note: futures do nothing unless you `.await` or poll them
+
+error: unused implementer of `FnOnce` that must be used
+ --> $DIR/must_use-in-stdlib-traits.rs:44:4
+ |
+LL | square_fn_once();
+ | ^^^^^^^^^^^^^^^^^
+ |
+ = note: closures are lazy and do nothing unless called
+
+error: unused implementer of `FnMut` that must be used
+ --> $DIR/must_use-in-stdlib-traits.rs:45:4
+ |
+LL | square_fn_mut();
+ | ^^^^^^^^^^^^^^^^
+ |
+ = note: closures are lazy and do nothing unless called
+
+error: unused implementer of `Fn` that must be used
+ --> $DIR/must_use-in-stdlib-traits.rs:46:4
+ |
+LL | square_fn();
+ | ^^^^^^^^^^^^
+ |
+ = note: closures are lazy and do nothing unless called
+
+error: aborting due to 5 previous errors
+