warning: current MSRV (Minimum Supported Rust Version) is `1.39.0` but this item is stable since `1.65.0`
      --> src/fmt.rs:48:58
       |
    48 |             if let BacktraceStatus::Captured = backtrace.status() {
       |                                                          ^^^^^^^^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv
       = note: `#[warn(clippy::incompatible_msrv)]` on by default

    warning: current MSRV (Minimum Supported Rust Version) is `1.39.0` but this item is stable since `1.52.0`
       --> src/lib.rs:680:41
        |
    680 |         let fmt_arguments_as_str = args.as_str();
        |                                         ^^^^^^^^
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv

rust-lang/rust-clippy#12257

    warning: current MSRV (Minimum Supported Rust Version) is `1.39.0` but this item is stable since `1.64.0`
      --> tests/test_macros.rs:64:39
       |
    64 |         future::ready(anyhow!("...")).await;
       |                                       ^^^^^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv
       = note: `-W clippy::incompatible-msrv` implied by `-W clippy::all`
       = help: to override `-W clippy::all` add `#[allow(clippy::incompatible_msrv)]`

    warning: current MSRV (Minimum Supported Rust Version) is `1.39.0` but this item is stable since `1.48.0`
      --> tests/test_macros.rs:64:9
       |
    64 |         future::ready(anyhow!("...")).await;
       |         ^^^^^^^^^^^^^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv

    warning: current MSRV (Minimum Supported Rust Version) is `1.39.0` but this item is stable since `1.64.0`
      --> tests/test_macros.rs:72:59
       |
    72 |         future::ready(anyhow!(message(Cell::new("...")))).await;
       |                                                           ^^^^^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv

    warning: current MSRV (Minimum Supported Rust Version) is `1.39.0` but this item is stable since `1.48.0`
      --> tests/test_macros.rs:72:9
       |
    72 |         future::ready(anyhow!(message(Cell::new("...")))).await;
       |         ^^^^^^^^^^^^^
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#incompatible_msrv

rust-lang/rust#117772

    warning: the item `String` is imported redundantly
       --> src/ensure.rs:2:5
        |
    2   | use alloc::string::String;
        |     ^^^^^^^^^^^^^^^^^^^^^
        |
       ::: nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/prelude/mod.rs:115:13
        |
    115 |     pub use super::v1::*;
        |             --------- the item `String` is already defined here
        |
        = note: `#[warn(unused_imports)]` on by default

    warning: the item `Box` is imported redundantly
       --> src/error.rs:7:5
        |
    7   | use alloc::boxed::Box;
        |     ^^^^^^^^^^^^^^^^^
        |
       ::: nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/prelude/mod.rs:115:13
        |
    115 |     pub use super::v1::*;
        |             --------- the item `Box` is already defined here

    warning: the item `Box` is imported redundantly
       --> src/ptr.rs:1:5
        |
    1   | use alloc::boxed::Box;
        |     ^^^^^^^^^^^^^^^^^
        |
       ::: nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/prelude/mod.rs:115:13
        |
    115 |     pub use super::v1::*;
        |             --------- the item `Box` is already defined here