error[E0700]: hidden type for `impl Trait` captures lifetime that does not appear in bounds
  --> $DIR/must_outlive_least_region_or_bound.rs:3:23
   |
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:6:32
   |
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[E0759]: `x` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
  --> $DIR/must_outlive_least_region_or_bound.rs:9:46
   |
LL | fn elided2(x: &i32) -> impl Copy + 'static { x }
   |               ----                           ^ ...is captured here...
   |               |
   |               this data with an anonymous lifetime `'_`...
   |
note: ...and is required to live as long as `'static` here
  --> $DIR/must_outlive_least_region_or_bound.rs:9:24
   |
LL | fn elided2(x: &i32) -> impl Copy + 'static { x }
   |                        ^^^^^^^^^^^^^^^^^^^
help: consider changing the `impl Trait`'s explicit `'static` bound to the lifetime of argument `x`
   |
LL | fn elided2(x: &i32) -> impl Copy + '_ { x }
   |                                    ~~
help: alternatively, add an explicit `'static` bound to this reference
   |
LL | fn elided2(x: &'static i32) -> impl Copy + 'static { x }
   |               ~~~~~~~~~~~~

error[E0759]: `x` has lifetime `'a` but it needs to satisfy a `'static` lifetime requirement
  --> $DIR/must_outlive_least_region_or_bound.rs:11:55
   |
LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x }
   |                     -------                           ^ ...is captured here...
   |                     |
   |                     this data with lifetime `'a`...
   |
note: ...and is required to live as long as `'static` here
  --> $DIR/must_outlive_least_region_or_bound.rs:11:33
   |
LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'static { x }
   |                                 ^^^^^^^^^^^^^^^^^^^
help: consider changing the `impl Trait`'s explicit `'static` bound to the lifetime of argument `x`
   |
LL | fn explicit2<'a>(x: &'a i32) -> impl Copy + 'a { x }
   |                                             ~~
help: alternatively, add an explicit `'static` bound to this reference
   |
LL | fn explicit2<'a>(x: &'static i32) -> impl Copy + 'static { x }
   |                     ~~~~~~~~~~~~

error[E0621]: explicit lifetime required in the type of `x`
  --> $DIR/must_outlive_least_region_or_bound.rs:13:24
   |
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[E0759]: `x` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
  --> $DIR/must_outlive_least_region_or_bound.rs:24:65
   |
LL | fn elided5(x: &i32) -> (Box<dyn Debug>, impl Debug) { (Box::new(x), x) }
   |               ---- this data with an anonymous lifetime `'_`... ^ ...is captured here, requiring it to live as long as `'static`
   |
help: to declare that the trait object captures data from argument `x`, you can add an explicit `'_` lifetime bound
   |
LL | fn elided5(x: &i32) -> (Box<dyn Debug + '_>, impl Debug) { (Box::new(x), x) }
   |                                       ++++
help: to declare that the `impl Trait` captures data from argument `x`, you can add an explicit `'_` lifetime bound
   |
LL | fn elided5(x: &i32) -> (Box<dyn Debug>, impl Debug + '_) { (Box::new(x), x) }
   |                                                    ++++

error[E0759]: `x` has lifetime `'a` but it needs to satisfy a `'static` lifetime requirement
  --> $DIR/must_outlive_least_region_or_bound.rs:29:69
   |
LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x }
   |                      ------- this data with lifetime `'a`...        ^ ...is captured here...
   |
note: ...and is required to live as long as `'static` here
  --> $DIR/must_outlive_least_region_or_bound.rs:29:34
   |
LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x }
   |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: consider changing the `impl Trait`'s explicit `'static` bound to the lifetime of argument `x`
   |
LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'a { x }
   |                                                           ~~
help: alternatively, add an explicit `'static` bound to this reference
   |
LL | fn with_bound<'a>(x: &'static i32) -> impl LifetimeTrait<'a> + 'static { x }
   |                      ~~~~~~~~~~~~

error[E0700]: hidden type for `impl Trait` captures lifetime that does not appear in bounds
  --> $DIR/must_outlive_least_region_or_bound.rs:33:61
   |
LL | fn move_lifetime_into_fn<'a, 'b>(x: &'a u32, y: &'b u32) -> impl Fn(&'a u32) {
   |                              --                             ^^^^^^^^^^^^^^^^
   |                              |
   |                              hidden type `[closure@$DIR/must_outlive_least_region_or_bound.rs:35:5: 35:31]` captures the lifetime `'b` as defined here
   |
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:38:51
   |
LL | fn ty_param_wont_outlive_static<T:Debug>(x: T) -> impl Debug + 'static {
   |                                 --                ^^^^^^^^^^^^^^^^^^^^ ...so that the type `T` will meet its required lifetime bounds
   |                                 |
   |                                 help: consider adding an explicit lifetime bound...: `T: 'static +`

error[E0759]: `x` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
  --> $DIR/must_outlive_least_region_or_bound.rs:16:50
   |
LL | fn elided3(x: &i32) -> Box<dyn Debug> { Box::new(x) }
   |               ----                               ^ ...is captured here, requiring it to live as long as `'static`
   |               |
   |               this data with an anonymous lifetime `'_`...
   |
help: to declare that the trait object captures data from argument `x`, you can add an explicit `'_` lifetime bound
   |
LL | fn elided3(x: &i32) -> Box<dyn Debug + '_> { Box::new(x) }
   |                                      ++++

error[E0759]: `x` has lifetime `'a` but it needs to satisfy a `'static` lifetime requirement
  --> $DIR/must_outlive_least_region_or_bound.rs:18:59
   |
LL | fn explicit3<'a>(x: &'a i32) -> Box<dyn Debug> { Box::new(x) }
   |                     -------                               ^ ...is captured here, requiring it to live as long as `'static`
   |                     |
   |                     this data with lifetime `'a`...
   |
help: to declare that the trait object captures data from argument `x`, you can add an explicit `'a` lifetime bound
   |
LL | fn explicit3<'a>(x: &'a i32) -> Box<dyn Debug + 'a> { Box::new(x) }
   |                                               ++++

error[E0759]: `x` has an anonymous lifetime `'_` but it needs to satisfy a `'static` lifetime requirement
  --> $DIR/must_outlive_least_region_or_bound.rs:20:60
   |
LL | fn elided4(x: &i32) -> Box<dyn Debug + 'static> { Box::new(x) }
   |               ----                                         ^ ...is captured here, requiring it to live as long as `'static`
   |               |
   |               this data with an anonymous lifetime `'_`...
   |
help: consider changing the trait object's explicit `'static` bound to the lifetime of argument `x`
   |
LL | fn elided4(x: &i32) -> Box<dyn Debug + '_> { Box::new(x) }
   |                                        ~~
help: alternatively, add an explicit `'static` bound to this reference
   |
LL | fn elided4(x: &'static i32) -> Box<dyn Debug + 'static> { Box::new(x) }
   |               ~~~~~~~~~~~~

error[E0759]: `x` has lifetime `'a` but it needs to satisfy a `'static` lifetime requirement
  --> $DIR/must_outlive_least_region_or_bound.rs:22:69
   |
LL | fn explicit4<'a>(x: &'a i32) -> Box<dyn Debug + 'static> { Box::new(x) }
   |                     ------- this data with lifetime `'a`...         ^ ...is captured here, requiring it to live as long as `'static`
   |
help: consider changing the trait object's explicit `'static` bound to the lifetime of argument `x`
   |
LL | fn explicit4<'a>(x: &'a i32) -> Box<dyn Debug + 'a> { Box::new(x) }
   |                                                 ~~
help: alternatively, add an explicit `'static` bound to this reference
   |
LL | fn explicit4<'a>(x: &'static i32) -> Box<dyn Debug + 'static> { Box::new(x) }
   |                     ~~~~~~~~~~~~

error: aborting due to 13 previous errors

Some errors have detailed explanations: E0310, E0621, E0700, E0759.
For more information about an error, try `rustc --explain E0310`.
