error[E0716]: temporary value dropped while borrowed --> $DIR/const-int-sign.rs:2:29 | LL | let x: &'static bool = &(5_i32.is_negative()); | ------------- ^^^^^^^^^^^^^^^^^^^^^ creates a temporary which is freed while still in use | | | type annotation requires that borrow lasts for `'static` ... LL | } | - temporary value is freed at the end of this statement error[E0716]: temporary value dropped while borrowed --> $DIR/const-int-sign.rs:4:29 | LL | let y: &'static bool = &(5_i32.is_positive()); | ------------- ^^^^^^^^^^^^^^^^^^^^^ creates a temporary which is freed while still in use | | | type annotation requires that borrow lasts for `'static` LL | LL | } | - temporary value is freed at the end of this statement error: aborting due to 2 previous errors For more information about this error, try `rustc --explain E0716`.