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Auto merge of rust-lang#131403 - practicalrs:fix_needless_lifetimes_p…
…2, r=petrochenkov Fix needless_lifetimes in rustc_serialize Hi, This PR fixes the following clipy warnings: ``` warning: the following explicit lifetimes could be elided: 'a --> compiler/rustc_serialize/src/serialize.rs:328:6 | 328 | impl<'a, S: Encoder, T: Encodable<S>> Encodable<S> for Cow<'a, [T]> | ^^ ^^ | = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes = note: `#[warn(clippy::needless_lifetimes)]` on by default help: elide the lifetimes | 328 - impl<'a, S: Encoder, T: Encodable<S>> Encodable<S> for Cow<'a, [T]> 328 + impl<S: Encoder, T: Encodable<S>> Encodable<S> for Cow<'_, [T]> | warning: the following explicit lifetimes could be elided: 'a --> compiler/rustc_serialize/src/serialize.rs:348:6 | 348 | impl<'a, S: Encoder> Encodable<S> for Cow<'a, str> { | ^^ ^^ | = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes help: elide the lifetimes | 348 - impl<'a, S: Encoder> Encodable<S> for Cow<'a, str> { 348 + impl<S: Encoder> Encodable<S> for Cow<'_, str> { | warning: the following explicit lifetimes could be elided: 'a --> compiler/rustc_serialize/src/serialize.rs:355:6 | 355 | impl<'a, D: Decoder> Decodable<D> for Cow<'a, str> { | ^^ ^^ | = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes help: elide the lifetimes | 355 - impl<'a, D: Decoder> Decodable<D> for Cow<'a, str> { 355 + impl<D: Decoder> Decodable<D> for Cow<'_, str> { ``` Best regards, Michal
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