This defaults to components miri + rust-src.

    error: deref which would be done by auto-deref
       --> src/error.rs:961:9
        |
    961 |         &**self
        |         ^^^^^^^ help: try this: `self`
        |
        = note: `-D clippy::explicit-auto-deref` implied by `-D clippy::all`
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#explicit_auto_deref

    error: deref which would be done by auto-deref
       --> src/error.rs:968:9
        |
    968 |         &**self
        |         ^^^^^^^ help: try this: `self`
        |
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#explicit_auto_deref

Starting in the most recent release of miri, the build.rs probe fails to
build even on nightly toolchain with one of the following errors:

    error: miri can only run programs that have a main function

    error: the current sysroot was built without `-Zalways-encode-mir`,
    or libcore seems missing. Use `cargo miri setup` to prepare a
    sysroot that is suitable for Miri.

which causes anyhow::Error's backtrace() inherent method to not exist.

    error[E0658]: use of unstable library feature 'backtrace'
      --> tests/test_backtrace.rs:20:19
       |
    20 |     let _ = error.backtrace();
       |                   ^^^^^^^^^
       |
       = note: see issue 53487 <rust-lang/rust#53487> for more information
       = help: add `#![feature(backtrace)]` to the crate attributes to enable

Fixed in nightly-2022-07-26.

Closes #246.

This reverts commit 8d25d6b.

    error: called `assert!` with `Result::is_ok`
      --> tests/test_macros.rs:29:5
       |
    29 |     assert!(f().is_ok());
       |     ^^^^^^^^^^^^^^^^^^^^ help: replace with: `f().unwrap()`
       |
       = note: `-D clippy::assertions-on-result-states` implied by `-D clippy::all`
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assertions_on_result_states

    error: called `assert!` with `Result::is_ok`
      --> tests/test_macros.rs:36:5
       |
    36 |     assert!(f().is_ok());
       |     ^^^^^^^^^^^^^^^^^^^^ help: replace with: `f().unwrap()`
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assertions_on_result_states

    error: called `assert!` with `Result::is_err`
      --> tests/test_macros.rs:42:5
       |
    42 |     assert!(f().is_err());
       |     ^^^^^^^^^^^^^^^^^^^^^ help: replace with: `f().unwrap_err()`
       |
       = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assertions_on_result_states

    error: called `assert!` with `Result::is_err`
       --> tests/test_downcast.rs:122:5
        |
    122 |     assert!(error.downcast::<&str>().is_err());
        |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: replace with: `error.downcast::<&str>().unwrap_err()`
        |
        = note: `-D clippy::assertions-on-result-states` implied by `-D clippy::all`
        = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#assertions_on_result_states

propagate --target to rustc invocation