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warning: unused `offset_of` call that must be used
--> $DIR/offset-of-must-use.rs:6:5
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LL | core::mem::offset_of!((String,), 0);
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the `offset_of` call produces a value
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note: the lint level is defined here
--> $DIR/offset-of-must-use.rs:3:9
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LL | #![warn(unused)]
| ^^^^^^
= note: `#[warn(unused_must_use)]` implied by `#[warn(unused)]`
= note: this warning originates in the macro `core::mem::offset_of` (in Nightly builds, run with -Z macro-backtrace for more info)
warning: 1 warning emitted
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