Ignore mismatched_lifetime_syntaxes lint

    warning: lifetime flowing from input to output with different syntax can be confusing
       --> src/map.rs:274:21
        |
    274 |     pub fn entry<S>(&mut self, key: S) -> Entry
        |                     ^^^^^^^^^             ----- the lifetime gets resolved as `'_`
        |                     |
        |                     this lifetime flows to the output
        |
        = note: `#[warn(mismatched_lifetime_syntaxes)]` on by default
    help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
        |
    274 |     pub fn entry<S>(&mut self, key: S) -> Entry<'_>
        |                                                ++++

    warning: lifetime flowing from input to output with different syntax can be confusing
       --> src/map.rs:303:17
        |
    303 |     pub fn iter(&self) -> Iter {
        |                 ^^^^^     ---- the lifetime gets resolved as `'_`
        |                 |
        |                 this lifetime flows to the output
        |
    help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
        |
    303 |     pub fn iter(&self) -> Iter<'_> {
        |                               ++++

    warning: lifetime flowing from input to output with different syntax can be confusing
       --> src/map.rs:311:21
        |
    311 |     pub fn iter_mut(&mut self) -> IterMut {
        |                     ^^^^^^^^^     ------- the lifetime gets resolved as `'_`
        |                     |
        |                     this lifetime flows to the output
        |
    help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
        |
    311 |     pub fn iter_mut(&mut self) -> IterMut<'_> {
        |                                          ++++

    warning: lifetime flowing from input to output with different syntax can be confusing
       --> src/map.rs:319:17
        |
    319 |     pub fn keys(&self) -> Keys {
        |                 ^^^^^     ---- the lifetime gets resolved as `'_`
        |                 |
        |                 this lifetime flows to the output
        |
    help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
        |
    319 |     pub fn keys(&self) -> Keys<'_> {
        |                               ++++

    warning: lifetime flowing from input to output with different syntax can be confusing
       --> src/map.rs:327:19
        |
    327 |     pub fn values(&self) -> Values {
        |                   ^^^^^     ------ the lifetime gets resolved as `'_`
        |                   |
        |                   this lifetime flows to the output
        |
    help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
        |
    327 |     pub fn values(&self) -> Values<'_> {
        |                                   ++++

    warning: lifetime flowing from input to output with different syntax can be confusing
       --> src/map.rs:335:23
        |
    335 |     pub fn values_mut(&mut self) -> ValuesMut {
        |                       ^^^^^^^^^     --------- the lifetime gets resolved as `'_`
        |                       |
        |                       this lifetime flows to the output
        |
    help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
        |
    335 |     pub fn values_mut(&mut self) -> ValuesMut<'_> {
        |                                              ++++

    warning: lifetime flowing from input to output with different syntax can be confusing
        --> src/value/de.rs:1388:19
         |
    1388 |     fn unexpected(&self) -> Unexpected {
         |                   ^^^^^     ---------- the lifetime gets resolved as `'_`
         |                   |
         |                   this lifetime flows to the output
         |
    help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
         |
    1388 |     fn unexpected(&self) -> Unexpected<'_> {
         |                                       ++++

    warning: lifetime flowing from input to output with different syntax can be confusing
       --> src/number.rs:798:30
        |
    798 |     pub(crate) fn unexpected(&self) -> Unexpected {
        |                              ^^^^^     ---------- the lifetime gets resolved as `'_`
        |                              |
        |                              this lifetime flows to the output
        |
    help: one option is to remove the lifetime for references and use the anonymous lifetime for paths
        |
    798 |     pub(crate) fn unexpected(&self) -> Unexpected<'_> {
        |                                                  ++++

Author: dtolnay

src/lib.rs

@@ -366,6 +366,7 @@
 #![deny(missing_docs)]
 #![no_std]
 #![cfg_attr(docsrs, feature(doc_cfg))]
+#![allow(unknown_lints, mismatched_lifetime_syntaxes)]
 
 #[cfg(not(any(feature = "std", feature = "alloc")))]
 compile_error! {