warning: `#[doc(hidden)]` is ignored on trait impl items
        --> src/parse.rs:1220:5
         |
    1220 |     #[doc(hidden)]
         |     ^^^^^^^^^^^^^^ help: remove this attribute
         |
         = note: `#[warn(unused_attributes)]` on by default
         = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
         = note: whether the impl item is `doc(hidden)` or not entirely depends on the corresponding trait item

    warning: `#[doc(hidden)]` is ignored on trait impl items
        --> src/parse.rs:1236:5
         |
    1236 |     #[doc(hidden)]
         |     ^^^^^^^^^^^^^^ help: remove this attribute
         |
         = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
         = note: whether the impl item is `doc(hidden)` or not entirely depends on the corresponding trait item

    warning: 2nd rule of macro `snapshot_impl` is never used
      --> tests/macros/mod.rs:44:5
       |
    44 |     (($($expr:tt)*) as $t:ty, @$snapshot:literal) => {{
       |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
       |
       = note: `#[warn(unused_macro_rules)]` on by default

    warning: 1st rule of macro `snapshot_impl` is never used
      --> tests/macros/mod.rs:37:5
       |
    37 |     (($expr:ident) as $t:ty, @$snapshot:literal) => {
       |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

    warning: 3rd rule of macro `snapshot_impl` is never used
      --> tests/macros/mod.rs:52:5
       |
    52 |     (($($expr:tt)*) , @$snapshot:literal) => {{
       |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

    warning: 2nd rule of macro `spanless_eq_enum` is never used
       --> tests/common/eq.rs:225:5
        |
    225 | /     {
    226 | |         $($name:ident)::+;
    227 | |         $([$($variant:ident)::+; $($fields:tt)*])*
    228 | |         $next:ident [$([$($named:tt)*])* $(![$ignore:tt])*] (!$i:tt $($field:tt)*)
    229 | |         $($rest:tt)*
    230 | |     } => {
        | |_____^
        |
        = note: `#[warn(unused_macro_rules)]` on by default

    warning: 1st rule of macro `check_keyword_matches` is never used
       --> src/macros.rs:176:5
        |
    176 |     (struct struct) => {};
        |     ^^^^^^^^^^^^^^^

    warning: 1st rule of macro `ast_enum_of_structs` is never used
      --> src/macros.rs:56:5
       |
    56 | /     (
    57 | |         $(#[$enum_attr:meta])*
    58 | |         $pub:ident $enum:ident $name:ident #$tag:ident $body:tt
    59 | |         $($remaining:tt)*
    60 | |     ) => {
       | |_____^
       |
       = note: `#[warn(unused_macro_rules)]` on by default

    warning: 1st rule of macro `ast_struct` is never used
     --> src/macros.rs:2:5
      |
    2 | /     (
    3 | |         [$($attrs_pub:tt)*]
    4 | |         struct $name:ident #full $($rest:tt)*
    5 | |     ) => {
      | |_____^
      |
      = note: `#[warn(unused_macro_rules)]` on by default

    warning: 1st rule of macro `generate_to_tokens` is never used
       --> src/macros.rs:120:5
        |
    120 |     (do_not_generate_to_tokens $($foo:tt)*) => ();
        |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
        |
        = note: `#[warn(unused_macro_rules)]` on by default

    warning: 2nd rule of macro `generate_to_tokens` is never used
       --> src/macros.rs:122:5
        |
    122 | /     (
    123 | |         ($($arms:tt)*) $tokens:ident $name:ident {
    124 | |             $(#[cfg $cfg_attr:tt])*
    125 | |             $(#[doc $($doc_attr:tt)*])*
    ...   |
    128 | |         }
    129 | |     ) => {
        | |_____^