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error: unused return value of `Interface::f` that must be used
--> tests/ui/must-use.rs:18:5
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18 | Thing.f();
| ^^^^^^^^^
|
note: the lint level is defined here
--> tests/ui/must-use.rs:1:9
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1 | #![deny(unused_must_use)]
| ^^^^^^^^^^^^^^^
help: use `let _ = ...` to ignore the resulting value
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18 | let _ = Thing.f();
| +++++++
|
