warning: the following explicit lifetimes could be elided: 'a
   --> src/port_forwarding.rs:145:6
    |
145 | impl<'a> fmt::Display for Socket<'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
    |
145 - impl<'a> fmt::Display for Socket<'a> {
145 + impl fmt::Display for Socket<'_> {
    |

warning: current MSRV (Minimum Supported Rust Version) is `1.63.0` but this item is stable since `1.64.0`
   --> src/child.rs:175:32
    |
175 |         let (stdout, stderr) = try_join!(stdout_read, stderr_read)?;
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv
    = note: `#[warn(clippy::incompatible_msrv)]` on by default
    = note: this warning originates in the macro `$crate::try_join` which comes from the expansion of the macro `try_join` (in Nightly builds, run with -Z macro-backtrace for more info)