error: unused logical operation that must be used --> $DIR/issue-85913.rs:4:5 | LL | function() && return 1; | ^^^^^^^^^^^^^^^^^^^^^^ the logical operation produces a value | note: the lint level is defined here --> $DIR/issue-85913.rs:1:9 | LL | #![deny(unused_must_use)] | ^^^^^^^^^^^^^^^ help: use `let _ = ...` to ignore the resulting value | LL | let _ = function() && return 1; | +++++++ error: aborting due to 1 previous error