error[E0700]: hidden type for `impl Trait` captures lifetime that does not appear in bounds
  --> $DIR/must_outlive_least_region_or_bound.rs:3:35
   |
LL | fn elided(x: &i32) -> impl Copy { x }
   |              ----                 ^
   |              |
   |              hidden type `&i32` captures the anonymous lifetime defined here
   |
help: to declare that the `impl Trait` captures `'_`, you can add an explicit `'_` lifetime bound
   |
LL | fn elided(x: &i32) -> impl Copy + '_ { x }
   |                                 ++++

error[E0700]: hidden type for `impl Trait` captures lifetime that does not appear in bounds
  --> $DIR/must_outlive_least_region_or_bound.rs:6:44
   |
LL | fn explicit<'a>(x: &'a i32) -> impl Copy { x }
   |             --                             ^
   |             |
   |             hidden type `&'a i32` captures the lifetime `'a` as defined here
   |
help: to declare that the `impl Trait` captures `'a`, you can add an explicit `'a` lifetime bound
   |
LL | fn explicit<'a>(x: &'a i32) -> impl Copy + 'a { x }
   |                                          ++++

error: lifetime may not live long enough
  --> $DIR/must_outlive_least_region_or_bound.rs:9:46
   |
LL | fn elided2(x: &i32) -> impl Copy + 'static { x }
   |               -                              ^ returning this value requires that `'1` must outlive `'static`
   |               |
   |               let's call the lifetime of this reference `'1`
   |
   = help: consider replacing `'1` with `'static`

error: lifetime may not live long enough
  --> $DIR/must_outlive_least_region_or_bound.rs:11:55
   |
LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x }
   |              -- lifetime `'a` defined here            ^ returning this value requires that `'a` must outlive `'static`
   |
   = help: consider replacing `'a` with `'static`

error[E0621]: explicit lifetime required in the type of `x`
  --> $DIR/must_outlive_least_region_or_bound.rs:13:41
   |
LL | fn foo<'a>(x: &i32) -> impl Copy + 'a { x }
   |               ----                      ^ lifetime `'a` required
   |               |
   |               help: add explicit lifetime `'a` to the type of `x`: `&'a i32`

error: lifetime may not live long enough
  --> $DIR/must_outlive_least_region_or_bound.rs:24:55
   |
LL | fn elided5(x: &i32) -> (Box<dyn Debug>, impl Debug) { (Box::new(x), x) }
   |               -                                       ^^^^^^^^^^^^^^^^ returning this value requires that `'1` must outlive `'static`
   |               |
   |               let's call the lifetime of this reference `'1`

error: lifetime may not live long enough
  --> $DIR/must_outlive_least_region_or_bound.rs:29:69
   |
LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x }
   |               -- lifetime `'a` defined here                         ^ returning this value requires that `'a` must outlive `'static`
   |
   = help: consider replacing `'a` with `'static`

error[E0700]: hidden type for `impl Trait` captures lifetime that does not appear in bounds
  --> $DIR/must_outlive_least_region_or_bound.rs:34:5
   |
LL | fn move_lifetime_into_fn<'a, 'b>(x: &'a u32, y: &'b u32) -> impl Fn(&'a u32) {
   |                              -- hidden type `[closure@$DIR/must_outlive_least_region_or_bound.rs:34:5: 34:31]` captures the lifetime `'b` as defined here
LL |     move |_| println!("{}", y)
   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
help: to declare that the `impl Trait` captures `'b`, you can add an explicit `'b` lifetime bound
   |
LL | fn move_lifetime_into_fn<'a, 'b>(x: &'a u32, y: &'b u32) -> impl Fn(&'a u32) + 'b {
   |                                                                              ++++

error[E0310]: the parameter type `T` may not live long enough
  --> $DIR/must_outlive_least_region_or_bound.rs:41:5
   |
LL | fn ty_param_wont_outlive_static<T:Debug>(x: T) -> impl Debug + 'static {
   |                                 -- help: consider adding an explicit lifetime bound...: `T: 'static +`
...
LL |     x
   |     ^ ...so that the type `T` will meet its required lifetime bounds

error: aborting due to 9 previous errors

Some errors have detailed explanations: E0310, E0621, E0700.
For more information about an error, try `rustc --explain E0310`.