Clippy

[dtolnay]

A clippy CI job blocked #515 from being merged.

warning: the following explicit lifetimes could be elided: 'a
   --> plugins/src/lib.rs:535:6
    |
535 | impl<'a> ServiceGenerator<'a> {
    |      ^^                   ^^
    |
    = 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
    |
535 - impl<'a> ServiceGenerator<'a> {
535 + impl ServiceGenerator<'_> {
    |

warning: the following explicit lifetimes could be elided: 'a
   --> plugins/src/lib.rs:811:6
    |
811 | impl<'a> ToTokens for ServiceGenerator<'a> {
    |      ^^                                ^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#needless_lifetimes
help: elide the lifetimes
    |
811 - impl<'a> ToTokens for ServiceGenerator<'a> {
811 + impl ToTokens for ServiceGenerator<'_> {
    |

warning: very complex type used. Consider factoring parts into `type` definitions
   --> tarpc/examples/tracing.rs:123:6
    |
123 |   ) -> retry::Retry<
    |  ______^
124 | |     impl Fn(&Result<Resp, RpcError>, u32) -> bool + Clone,
125 | |     load_balance::RoundRobin<client::Channel<Arc<Req>, Resp>>,
126 | | >
    | |_^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#type_complexity
    = note: `#[warn(clippy::type_complexity)]` on by default

[tikue]

Thank you!