Resolve unexpected_cfgs warning

    warning: unexpected `cfg` condition name: `exhaustive`
       --> src/lib.rs:342:23
        |
    342 | #![cfg_attr(all(test, exhaustive), feature(non_exhaustive_omitted_patterns_lint))]
        |                       ^^^^^^^^^^
        |
        = help: expected names are: `clippy`, `debug_assertions`, `doc`, `docsrs`, `doctest`, `feature`, `miri`, `overflow_checks`, `panic`, `proc_macro`, `relocation_model`, `rustfmt`, `sanitize`, `sanitizer_cfi_generalize_pointers`, `sanitizer_cfi_normalize_integers`, `target_abi`, `target_arch`, `target_endian`, `target_env`, `target_family`, `target_feature`, `target_has_atomic`, `target_has_atomic_equal_alignment`, `target_has_atomic_load_store`, `target_os`, `target_pointer_width`, `target_thread_local`, `target_vendor`, `test`, `ub_checks`, `unix`, `windows`
        = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
        = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration
        = note: `#[warn(unexpected_cfgs)]` on by default

    warning: unexpected `cfg` condition name: `prettyplease_debug`
       --> src/algorithm.rs:287:17
        |
    287 |         if cfg!(prettyplease_debug) {
        |                 ^^^^^^^^^^^^^^^^^^
        |
        = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(prettyplease_debug)");` to the top of the `build.rs`
        = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `prettyplease_debug_indent`
       --> src/algorithm.rs:292:21
        |
    292 |             if cfg!(prettyplease_debug_indent) {
        |                     ^^^^^^^^^^^^^^^^^^^^^^^^^
        |
        = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(prettyplease_debug_indent)");` to the top of the `build.rs`
        = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `prettyplease_debug`
       --> src/algorithm.rs:319:17
        |
    319 |         if cfg!(prettyplease_debug) {
        |                 ^^^^^^^^^^^^^^^^^^
        |
        = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(prettyplease_debug)");` to the top of the `build.rs`
        = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `prettyplease_debug`
       --> src/algorithm.rs:341:21
        |
    341 |             if cfg!(prettyplease_debug) {
        |                     ^^^^^^^^^^^^^^^^^^
        |
        = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(prettyplease_debug)");` to the top of the `build.rs`
        = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `prettyplease_debug`
       --> src/algorithm.rs:349:21
        |
    349 |             if cfg!(prettyplease_debug) {
        |                     ^^^^^^^^^^^^^^^^^^
        |
        = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(prettyplease_debug)");` to the top of the `build.rs`
        = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
      --> src/expr.rs:23:35
       |
    23 |             #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
       |                                   ^^^^^^^^^^
       |
       = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
       = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
       --> src/expr.rs:953:39
        |
    953 |                 #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
        |                                       ^^^^^^^^^^
        |
        = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
        = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
       --> src/expr.rs:990:39
        |
    990 |                 #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
        |                                       ^^^^^^^^^^
        |
        = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
        = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
        --> src/expr.rs:1010:31
         |
    1010 |         #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
         |                               ^^^^^^^^^^
         |
         = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
         = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
        --> src/expr.rs:1061:31
         |
    1061 |         #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
         |                               ^^^^^^^^^^
         |
         = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
         = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
        --> src/expr.rs:1117:31
         |
    1117 |         #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
         |                               ^^^^^^^^^^
         |
         = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
         = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
        --> src/expr.rs:1182:31
         |
    1182 |         #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
         |                               ^^^^^^^^^^
         |
         = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
         = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
        --> src/expr.rs:1234:31
         |
    1234 |         #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
         |                               ^^^^^^^^^^
         |
         = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
         = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
       --> src/generics.rs:106:35
        |
    106 |             #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
        |                                   ^^^^^^^^^^
        |
        = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
        = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
       --> src/generics.rs:292:35
        |
    292 |             #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
        |                                   ^^^^^^^^^^
        |
        = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
        = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
      --> src/item.rs:18:35
       |
    18 |             #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
       |                                   ^^^^^^^^^^
       |
       = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
       = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
       --> src/item.rs:783:35
        |
    783 |             #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
        |                                   ^^^^^^^^^^
        |
        = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
        = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
       --> src/item.rs:925:35
        |
    925 |             #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
        |                                   ^^^^^^^^^^
        |
        = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
        = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
        --> src/item.rs:1115:35
         |
    1115 |             #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
         |                                   ^^^^^^^^^^
         |
         = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
         = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
        --> src/item.rs:1370:35
         |
    1370 |             #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
         |                                   ^^^^^^^^^^
         |
         = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
         = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
     --> src/lit.rs:8:35
      |
    8 |             #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
      |                                   ^^^^^^^^^^
      |
      = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
      = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
      --> src/pat.rs:14:35
       |
    14 |             #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
       |                                   ^^^^^^^^^^
       |
       = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
       = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
      --> src/path.rs:50:35
       |
    50 |             #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
       |                                   ^^^^^^^^^^
       |
       = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
       = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
      --> src/path.rs:55:43
       |
    55 |                     #![cfg_attr(all(test, exhaustive), allow(non_exhaustive_omitted_patterns))]
       |                                           ^^^^^^^^^^
       |
       = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
       = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
      --> src/path.rs:99:39
       |
    99 |                 #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
       |                                       ^^^^^^^^^^
       |
       = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
       = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
      --> src/stmt.rs:85:31
       |
    85 |         #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
       |                               ^^^^^^^^^^
       |
       = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
       = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
      --> src/stmt.rs:92:39
       |
    92 |                 #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
       |                                       ^^^^^^^^^^
       |
       = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
       = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
       --> src/stmt.rs:174:31
        |
    174 |         #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
        |                               ^^^^^^^^^^
        |
        = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
        = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

    warning: unexpected `cfg` condition name: `exhaustive`
      --> src/ty.rs:15:35
       |
    15 |             #![cfg_attr(all(test, exhaustive), deny(non_exhaustive_omitted_patterns))]
       |                                   ^^^^^^^^^^
       |
       = help: consider using a Cargo feature instead or adding `println!("cargo::rustc-check-cfg=cfg(exhaustive)");` to the top of the `build.rs`
       = note: see <https://doc.rust-lang.org/nightly/cargo/reference/build-scripts.html#rustc-check-cfg> for more information about checking conditional configuration

build.rs

@@ -1,5 +1,9 @@
 fn main() {
     println!("cargo:rerun-if-changed=build.rs");
 
+    println!("cargo:rustc-check-cfg=cfg(exhaustive)");
+    println!("cargo:rustc-check-cfg=cfg(prettyplease_debug)");
+    println!("cargo:rustc-check-cfg=cfg(prettyplease_debug_indent)");
+
     println!(concat!("cargo:VERSION=", env!("CARGO_PKG_VERSION")));
 }