error[E0381]: used binding `y` is possibly-uninitialized --> $DIR/no-non-guaranteed-initialization.rs:9:5 | LL | let y; | - binding declared here but left uninitialized LL | if x > 5 { | ----- if this `if` condition is `false`, `y` is not initialized LL | y = echo(10).await; LL | } | - an `else` arm might be missing here, initializing `y` LL | y | ^ `y` used here but it is possibly-uninitialized error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0381`.