error: `foo` is not yet stable as a const fn --> $DIR/dont_promote_unstable_const_fn.rs:14:25 | LL | const fn bar() -> u32 { foo() } | ^^^^^ | = help: add `#![feature(foo)]` to the crate attributes to enable error[E0716]: temporary value dropped while borrowed --> $DIR/dont_promote_unstable_const_fn.rs:17:28 | LL | let _: &'static u32 = &foo(); | ------------ ^^^^^ creates a temporary value 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/dont_promote_unstable_const_fn.rs:21:28 | LL | let _: &'static u32 = &meh(); | ------------ ^^^^^ creates a temporary value 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/dont_promote_unstable_const_fn.rs:22:26 | LL | let x: &'static _ = &std::time::Duration::from_millis(42).subsec_millis(); | ---------- ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ creates a temporary value 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 4 previous errors For more information about this error, try `rustc --explain E0716`.