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rust-clippy/tests/ui/extra_unused_lifetimes.rs

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#![allow(
unused,
dead_code,
clippy::needless_lifetimes,
clippy::needless_pass_by_value,
clippy::needless_arbitrary_self_type
)]
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#![warn(clippy::extra_unused_lifetimes)]
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fn empty() {}
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fn used_lt<'a>(x: &'a u8) {}
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fn unused_lt<'a>(x: u8) {}
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fn unused_lt_transitive<'a, 'b: 'a>(x: &'b u8) {
// 'a is useless here since it's not directly bound
}
fn lt_return<'a, 'b: 'a>(x: &'b u8) -> &'a u8 {
panic!()
}
fn lt_return_only<'a>() -> &'a u8 {
panic!()
}
fn unused_lt_blergh<'a>(x: Option<Box<dyn Send + 'a>>) {}
trait Foo<'a> {
fn x(&self, a: &'a u8);
}
impl<'a> Foo<'a> for u8 {
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fn x(&self, a: &'a u8) {}
}
struct Bar;
impl Bar {
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fn x<'a>(&self) {}
}
// test for #489 (used lifetimes in bounds)
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pub fn parse<'a, I: Iterator<Item = &'a str>>(_it: &mut I) {
unimplemented!()
}
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pub fn parse2<'a, I>(_it: &mut I)
where
I: Iterator<Item = &'a str>,
{
unimplemented!()
}
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struct X {
x: u32,
}
impl X {
fn self_ref_with_lifetime<'a>(&'a self) {}
fn explicit_self_with_lifetime<'a>(self: &'a Self) {}
}
// Methods implementing traits must have matching lifetimes
mod issue4291 {
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trait BadTrait {
fn unused_lt<'a>(x: u8) {}
}
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impl BadTrait for () {
fn unused_lt<'a>(_x: u8) {}
}
}
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fn main() {}