error: non-binding let on a type that implements `Drop` --> $DIR/issue-119696-err-on-fn.rs:5:5 | LL | let _ = foo(); | ^^^^^^^^^^^^^^ | note: the lint level is defined here --> $DIR/issue-119696-err-on-fn.rs:3:9 | LL | #![deny(let_underscore_drop)] | ^^^^^^^^^^^^^^^^^^^ help: consider binding to an unused variable to avoid immediately dropping the value | LL | let _unused = foo(); | ~~~~~~~ help: consider immediately dropping the value | LL | drop(foo()); | ~~~~~ + error: aborting due to 1 previous error