rust-lang/rust-clippy#6984

    error: wildcard matches only a single variant and will also match any future added variants
        --> serde_derive/src/internals/attr.rs:1918:9
         |
    1918 |         _ => {}
         |         ^ help: try this: `syn::Type::__TestExhaustive(_)`
         |
    note: the lint level is defined here
        --> serde_derive/src/lib.rs:18:22
         |
    18   | #![deny(clippy::all, clippy::pedantic)]
         |                      ^^^^^^^^^^^^^^^^
         = note: `#[deny(clippy::match_wildcard_for_single_variants)]` implied by `#[deny(clippy::pedantic)]`
         = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_wildcard_for_single_variants

    error: wildcard matches only a single variant and will also match any future added variants
       --> serde_derive/src/internals/receiver.rs:153:13
        |
    153 |             _ => {}
        |             ^ help: try this: `Type::__TestExhaustive(_)`
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_wildcard_for_single_variants

    error: wildcard matches only a single variant and will also match any future added variants
       --> serde_derive/src/bound.rs:190:17
        |
    190 |                 _ => {}
        |                 ^ help: try this: `syn::Type::__TestExhaustive(_)`
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#match_wildcard_for_single_variants

rust-lang/rust-clippy#7054

    error: all if blocks contain the same code at the end
        --> serde_derive/src/de.rs:2160:5
         |
    2160 | /         &fallthrough_arm_tokens
    2161 | |     };
         | |_____^
         |
    note: the lint level is defined here
        --> serde_derive/src/lib.rs:18:9
         |
    18   | #![deny(clippy::all, clippy::pedantic)]
         |         ^^^^^^^^^^^
         = note: `#[deny(clippy::branches_sharing_code)]` implied by `#[deny(clippy::all)]`
         = note: The end suggestion probably needs some adjustments to use the expression result correctly
         = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#branches_sharing_code
    help: consider moving the end statements out like this
         |
    2160 |     }
    2161 |     &fallthrough_arm_tokens;
         |

    warning: lint `safe_packed_borrows` has been renamed to `unaligned_references`
        --> test_suite/tests/test_macros.rs:1926:8
         |
    1926 | #[deny(safe_packed_borrows)]
         |        ^^^^^^^^^^^^^^^^^^^ help: use the new name: `unaligned_references`
         |
         = note: `#[warn(renamed_and_removed_lints)]` on by default

Build using relative path in repo if Windows lost the symlink

    error: the feature `non_ascii_idents` has been stable since 1.53.0 and no longer requires an attribute to enable
     --> test_suite/tests/test_gen.rs:6:43
      |
    6 | #![cfg_attr(feature = "unstable", feature(non_ascii_idents))]
      |                                           ^^^^^^^^^^^^^^^^
      |
    note: the lint level is defined here
     --> test_suite/tests/test_gen.rs:5:9
      |
    5 | #![deny(warnings)]
      |         ^^^^^^^^
      = note: `#[deny(stable_features)]` implied by `#[deny(warnings)]`

Remove non_ascii_idents feature gate from test suite

    error: used `flat_map` where `filter_map` could be used instead
      --> serde_derive/src/bound.rs:52:10
       |
    52 |         .flat_map(|field| from_field(&field.attrs))
       |          ^^^^^^^^ help: try: `filter_map`
       |
    note: the lint level is defined here
      --> serde_derive/src/lib.rs:18:22
       |
    18 | #![deny(clippy::all, clippy::pedantic)]
       |                      ^^^^^^^^^^^^^^^^
       = note: `#[deny(clippy::flat_map_option)]` implied by `#[deny(clippy::pedantic)]`
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#flat_map_option

    error: used `flat_map` where `filter_map` could be used instead
      --> serde_derive/src/bound.rs:74:10
       |
    74 |         .flat_map(|variant| from_variant(&variant.attrs))
       |          ^^^^^^^^ help: try: `filter_map`
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#flat_map_option

    warning: lint `clippy::filter_map` has been removed: this lint has been replaced by `manual_filter_map`, a more specific lint
      --> serde_derive/src/lib.rs:42:5
       |
    42 |     clippy::filter_map,
       |     ^^^^^^^^^^^^^^^^^^
       |
       = note: `#[warn(renamed_and_removed_lints)]` on by default

    warning: lint `clippy::filter_map` has been removed: this lint has been replaced by `manual_filter_map`, a more specific lint
      --> serde_derive/src/lib.rs:42:5
       |
    42 |     clippy::filter_map,
       |     ^^^^^^^^^^^^^^^^^^

Iterator::copied was introduced in Rust 1.35, whereas serde_test
currently supports a minimum compiler version of 1.13.

    error: used `cloned` where `copied` could be used instead
       --> serde_test/src/de.rs:49:29
        |
    49  |         self.tokens.first().cloned()
        |                             ^^^^^^ help: try: `copied`
        |
    note: the lint level is defined here
       --> serde_test/src/lib.rs:149:52
        |
    149 | #![cfg_attr(feature = "cargo-clippy", deny(clippy, clippy_pedantic))]
        |                                                    ^^^^^^^^^^^^^^^
        = note: `#[deny(clippy::cloned_instead_of_copied)]` implied by `#[deny(clippy::pedantic)]`
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#cloned_instead_of_copied

…oms` lint group in `serde_derive`-generated code

Allow only `unused_extern_crates` instead of the whole `rust_2018_idioms` lint group in `serde_derive`-generated code