tests: Fix dead_code warning for tuple struct #2820
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``` error: field `0` is never read --> futures-executor/tests/local_pool.rs:13:16 | 13 | struct Pending(Rc<()>); | ------- ^^^^^^ | | | field in this struct | = note: `-D dead-code` implied by `-D warnings` = help: to override `-D warnings` add `#[allow(dead_code)]` help: consider changing the field to be of unit type to suppress this warning while preserving the field numbering, or remove the field | 13 | struct Pending(()); | ~~ ```
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rust-lang/rust#119645