error: cannot infer an appropriate lifetime
  --> $DIR/must_outlive_least_region_or_bound.rs:3:35
   |
LL | fn elided(x: &i32) -> impl Copy { x }
   |                       ---------   ^ ...but this borrow...
   |                       |
   |                       this return type evaluates to the `'static` lifetime...
   |
note: ...can't outlive the anonymous lifetime #1 defined on the function body at 3:1
  --> $DIR/must_outlive_least_region_or_bound.rs:3:1
   |
LL | fn elided(x: &i32) -> impl Copy { x }
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
help: you can add a constraint to the return type to make it last less than `'static` and match the anonymous lifetime #1 defined on the function body at 3:1
   |
LL | fn elided(x: &i32) -> impl Copy + '_ { x }
   |                       ^^^^^^^^^^^^^^

error: cannot infer an appropriate lifetime
  --> $DIR/must_outlive_least_region_or_bound.rs:6:44
   |
LL | fn explicit<'a>(x: &'a i32) -> impl Copy { x }
   |                                ---------   ^ ...but this borrow...
   |                                |
   |                                this return type evaluates to the `'static` lifetime...
   |
note: ...can't outlive the lifetime `'a` as defined on the function body at 6:13
  --> $DIR/must_outlive_least_region_or_bound.rs:6:13
   |
LL | fn explicit<'a>(x: &'a i32) -> impl Copy { x }
   |             ^^
help: you can add a constraint to the return type to make it last less than `'static` and match the lifetime `'a` as defined on the function body at 6:13
   |
LL | fn explicit<'a>(x: &'a i32) -> impl Copy + 'a { x }
   |                                ^^^^^^^^^^^^^^

error: cannot infer an appropriate lifetime
  --> $DIR/must_outlive_least_region_or_bound.rs:12:69
   |
LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x }
   |                                  --------------------------------   ^ ...but this borrow...
   |                                  |
   |                                  this return type evaluates to the `'static` lifetime...
   |
note: ...can't outlive the lifetime `'a` as defined on the function body at 12:15
  --> $DIR/must_outlive_least_region_or_bound.rs:12:15
   |
LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static { x }
   |               ^^
help: you can add a constraint to the return type to make it last less than `'static` and match the lifetime `'a` as defined on the function body at 12:15
   |
LL | fn with_bound<'a>(x: &'a i32) -> impl LifetimeTrait<'a> + 'static + 'a { x }
   |                                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error[E0623]: lifetime mismatch
  --> $DIR/must_outlive_least_region_or_bound.rs:17:61
   |
LL | fn move_lifetime_into_fn<'a, 'b>(x: &'a u32, y: &'b u32) -> impl Fn(&'a u32) {
   |                                                 -------     ^^^^^^^^^^^^^^^^
   |                                                 |           |
   |                                                 |           ...but data from `y` is returned here
   |                                                 this parameter and the return type are declared with different lifetimes...

error[E0310]: the parameter type `T` may not live long enough
  --> $DIR/must_outlive_least_region_or_bound.rs:22:51
   |
LL | fn ty_param_wont_outlive_static<T:Debug>(x: T) -> impl Debug + 'static {
   |                                 --                ^^^^^^^^^^^^^^^^^^^^
   |                                 |
   |                                 help: consider adding an explicit lifetime bound `T: 'static`...
   |
note: ...so that the type `T` will meet its required lifetime bounds
  --> $DIR/must_outlive_least_region_or_bound.rs:22:51
   |
LL | fn ty_param_wont_outlive_static<T:Debug>(x: T) -> impl Debug + 'static {
   |                                                   ^^^^^^^^^^^^^^^^^^^^

error: aborting due to 5 previous errors

Some errors have detailed explanations: E0310, E0623.
For more information about an error, try `rustc --explain E0310`.