error: unused return value of `anyhow::private::must_use` that must be used
 --> tests/ui/must-use.rs:8:9
  |
8 |         anyhow!("it failed");
  |         ^^^^^^^^^^^^^^^^^^^^
  |
note: the lint level is defined here
 --> tests/ui/must-use.rs:1:9
  |
1 | #![deny(unused_must_use)]
  |         ^^^^^^^^^^^^^^^
  = note: this error originates in the macro `anyhow` (in Nightly builds, run with -Z macro-backtrace for more info)