Ignore mismatched_lifetime_syntaxes lint

    warning: lifetime flowing from input to output with different syntax can be confusing
      --> impl/src/attr.rs:69:19
       |
    69 | pub fn get(input: &[Attribute]) -> Result<Attrs> {
       |                   ^^^^^^^^^^^^            ----- 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
       |
    69 | pub fn get(input: &[Attribute]) -> Result<Attrs<'_>> {
       |                                                ++++

    warning: lifetime flowing from input to output with different syntax can be confusing
     --> impl/src/prop.rs:7:30
      |
    7 |     pub(crate) fn from_field(&self) -> Option<&Field> {
      |                              ^^^^^            ------
      |                              |                ||
      |                              |                |the lifetimes get resolved as `'_`
      |                              |                the lifetimes get 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
      |
    7 |     pub(crate) fn from_field(&self) -> Option<&Field<'_>> {
      |                                                     ++++

    warning: lifetime flowing from input to output with different syntax can be confusing
      --> impl/src/prop.rs:11:32
       |
    11 |     pub(crate) fn source_field(&self) -> Option<&Field> {
       |                                ^^^^^            ------
       |                                |                ||
       |                                |                |the lifetimes get resolved as `'_`
       |                                |                the lifetimes get 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
       |
    11 |     pub(crate) fn source_field(&self) -> Option<&Field<'_>> {
       |                                                       ++++

    warning: lifetime flowing from input to output with different syntax can be confusing
      --> impl/src/prop.rs:15:35
       |
    15 |     pub(crate) fn backtrace_field(&self) -> Option<&Field> {
       |                                   ^^^^^            ------
       |                                   |                ||
       |                                   |                |the lifetimes get resolved as `'_`
       |                                   |                the lifetimes get 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
       |
    15 |     pub(crate) fn backtrace_field(&self) -> Option<&Field<'_>> {
       |                                                          ++++

    warning: lifetime flowing from input to output with different syntax can be confusing
      --> impl/src/prop.rs:19:44
       |
    19 |     pub(crate) fn distinct_backtrace_field(&self) -> Option<&Field> {
       |                                            ^^^^^            ------
       |                                            |                ||
       |                                            |                |the lifetimes get resolved as `'_`
       |                                            |                the lifetimes get 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
       |
    19 |     pub(crate) fn distinct_backtrace_field(&self) -> Option<&Field<'_>> {
       |                                                                   ++++

    warning: lifetime flowing from input to output with different syntax can be confusing
      --> impl/src/prop.rs:54:30
       |
    54 |     pub(crate) fn from_field(&self) -> Option<&Field> {
       |                              ^^^^^            ------
       |                              |                ||
       |                              |                |the lifetimes get resolved as `'_`
       |                              |                the lifetimes get 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
       |
    54 |     pub(crate) fn from_field(&self) -> Option<&Field<'_>> {
       |                                                     ++++

    warning: lifetime flowing from input to output with different syntax can be confusing
      --> impl/src/prop.rs:58:32
       |
    58 |     pub(crate) fn source_field(&self) -> Option<&Field> {
       |                                ^^^^^            ------
       |                                |                ||
       |                                |                |the lifetimes get resolved as `'_`
       |                                |                the lifetimes get 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
       |
    58 |     pub(crate) fn source_field(&self) -> Option<&Field<'_>> {
       |                                                       ++++

    warning: lifetime flowing from input to output with different syntax can be confusing
      --> impl/src/prop.rs:62:35
       |
    62 |     pub(crate) fn backtrace_field(&self) -> Option<&Field> {
       |                                   ^^^^^            ------
       |                                   |                ||
       |                                   |                |the lifetimes get resolved as `'_`
       |                                   |                the lifetimes get 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
       |
    62 |     pub(crate) fn backtrace_field(&self) -> Option<&Field<'_>> {
       |                                                          ++++

    warning: lifetime flowing from input to output with different syntax can be confusing
      --> impl/src/prop.rs:66:44
       |
    66 |     pub(crate) fn distinct_backtrace_field(&self) -> Option<&Field> {
       |                                            ^^^^^            ------
       |                                            |                ||
       |                                            |                |the lifetimes get resolved as `'_`
       |                                            |                the lifetimes get 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
       |
    66 |     pub(crate) fn distinct_backtrace_field(&self) -> Option<&Field<'_>> {
       |                                                                   ++++

Author: dtolnay

impl/src/lib.rs

@@ -15,6 +15,7 @@
     clippy::too_many_lines,
     clippy::wrong_self_convention
 )]
+#![allow(unknown_lints, mismatched_lifetime_syntaxes)]
 
 extern crate proc_macro;