1error: unused pinned boxed `Future` trait object that must be used
2  --> tests/ui/must-use.rs:18:5
3   |
418 |     Thing.f();
5   |     ^^^^^^^^^
6   |
7   = note: futures do nothing unless you `.await` or poll them
8note: the lint level is defined here
9  --> tests/ui/must-use.rs:1:9
10   |
111  | #![deny(unused_must_use)]
12   |         ^^^^^^^^^^^^^^^
13
14error: unused return value of `Interface::f` that must be used
15  --> tests/ui/must-use.rs:18:5
16   |
1718 |     Thing.f();
18   |     ^^^^^^^^^
19   |
20help: use `let _ = ...` to ignore the resulting value
21   |
2218 |     let _ = Thing.f();
23   |     +++++++
24