warning: variable does not need to be mutable
      --> tests/common/parse.rs:28:17
       |
    28 |             Err(mut diagnostic) => {
       |                 ----^^^^^^^^^^
       |                 |
       |                 help: remove this `mut`
       |
       = note: `#[warn(unused_mut)]` on by default

    warning: variable does not need to be mutable
       --> tests/test_round_trip.rs:109:21
        |
    109 |                 Err(mut diagnostic) => {
        |                     ----^^^^^^^^^^
        |                     |
        |                     help: remove this `mut`

rust-lang/rust-clippy#12133

    warning: function cannot return without recursing
      --> src/lifetime.rs:90:5
       |
    90 | /     fn eq(&self, other: &Lifetime) -> bool {
    91 | |         self.ident.eq(&other.ident)
    92 | |     }
       | |_____^
       |
    note: recursive call site
      --> src/lifetime.rs:91:9
       |
    91 |         self.ident.eq(&other.ident)
       |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#unconditional_recursion
       = note: `-W clippy::unconditional-recursion` implied by `-W clippy::all`
       = help: to override `-W clippy::all` add `#[allow(clippy::unconditional_recursion)]`

    warning: method `try_into_tokens` is never used
      --> tests/macros/mod.rs:78:8
       |
    77 | pub trait TryIntoTokens {
       |           ------------- method in this trait
    78 |     fn try_into_tokens(self) -> Result<proc_macro2::TokenStream>;
       |        ^^^^^^^^^^^^^^^
       |
       = note: `#[warn(dead_code)]` on by default

Improve error location at eof in LitStr::parse