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warning: lifetime parameter `'a` never used
--> $DIR/unused-lifetimes.rs:15:28
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LL | pub fn by_value(_x: unsafe<'a> S) -> usize {
| -------^^-- help: elide the unused lifetime
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note: the lint level is defined here
--> $DIR/unused-lifetimes.rs:5:9
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LL | #![warn(unused_lifetimes)]
| ^^^^^^^^^^^^^^^^
warning: 1 warning emitted
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