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)