error[E0261]: use of undeclared lifetime name `'a`
  --> $DIR/missing-lifetimes-in-signature.rs:37:11
   |
LL | fn baz<G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
   |        -  ^^ undeclared lifetime
   |        |
   |        help: consider introducing lifetime `'a` here: `'a,`

warning: elided lifetime has a name
  --> $DIR/missing-lifetimes-in-signature.rs:102:64
   |
LL | fn ok2<'a, G: 'a, T>(g: G, dest: &'a mut T) -> impl FnOnce() + '_ + 'a
   |        -- lifetime `'a` declared here                          ^^ this elided lifetime gets resolved as `'a`
   |
   = note: `#[warn(elided_named_lifetimes)]` on by default

error[E0700]: hidden type for `impl FnOnce()` captures lifetime that does not appear in bounds
  --> $DIR/missing-lifetimes-in-signature.rs:19:5
   |
LL |   fn foo<G, T>(g: G, dest: &mut T) -> impl FnOnce()
   |                            ------     ------------- opaque type defined here
   |                            |
   |                            hidden type `{closure@$DIR/missing-lifetimes-in-signature.rs:19:5: 19:12}` captures the anonymous lifetime defined here
...
LL | /     move || {
LL | |
LL | |         *dest = g.get();
LL | |     }
   | |_____^
   |
help: add a `use<...>` bound to explicitly capture `'_`
   |
LL | fn foo<G, T>(g: G, dest: &mut T) -> impl FnOnce() + use<'_, G, T>
   |                                                   +++++++++++++++

error[E0311]: the parameter type `G` may not live long enough
  --> $DIR/missing-lifetimes-in-signature.rs:30:5
   |
LL |   fn bar<G, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
   |                            ------ the parameter type `G` must be valid for the anonymous lifetime defined here...
...
LL | /     move || {
LL | |
LL | |         *dest = g.get();
LL | |     }
   | |_____^ ...so that the type `G` will meet its required lifetime bounds
   |
help: consider adding an explicit lifetime bound
   |
LL ~ fn bar<'a, G, T>(g: G, dest: &'a mut T) -> impl FnOnce() + 'a
LL | where
LL ~     G: Get<T> + 'a,
   |

error[E0311]: the parameter type `G` may not live long enough
  --> $DIR/missing-lifetimes-in-signature.rs:52:5
   |
LL |   fn qux<'a, G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_
   |                                    ------ the parameter type `G` must be valid for the anonymous lifetime defined here...
...
LL | /     move || {
LL | |
LL | |         *dest = g.get();
LL | |     }
   | |_____^ ...so that the type `G` will meet its required lifetime bounds
   |
help: consider adding an explicit lifetime bound
   |
LL | fn qux<'b, 'a, G: 'a + 'b, T>(g: G, dest: &'b mut T) -> impl FnOnce() + 'b
   |        +++           ++++                  ++                           ~~

error[E0311]: the parameter type `G` may not live long enough
  --> $DIR/missing-lifetimes-in-signature.rs:61:9
   |
LL |       fn qux<'b, G: Get<T> + 'b, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ {
   |                                                 ------ the parameter type `G` must be valid for the anonymous lifetime defined here...
LL | /         move || {
LL | |
LL | |             *dest = g.get();
LL | |         }
   | |_________^ ...so that the type `G` will meet its required lifetime bounds
   |
help: consider adding an explicit lifetime bound
   |
LL |     fn qux<'c, 'b, G: Get<T> + 'b + 'c, T>(g: G, dest: &'c mut T) -> impl FnOnce() + 'c {
   |            +++                    ++++                  ++                           ~~

error[E0311]: the parameter type `G` may not live long enough
  --> $DIR/missing-lifetimes-in-signature.rs:73:5
   |
LL |   fn bat<'a, G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ + 'a
   |                                    ------ the parameter type `G` must be valid for the anonymous lifetime defined here...
...
LL | /     move || {
LL | |
LL | |
LL | |         *dest = g.get();
LL | |     }
   | |_____^ ...so that the type `G` will meet its required lifetime bounds
   |
help: consider adding an explicit lifetime bound
   |
LL | fn bat<'b, 'a, G: 'a + 'b, T>(g: G, dest: &'b mut T) -> impl FnOnce() + 'b + 'a
   |        +++           ++++                  ++                           ~~

error[E0621]: explicit lifetime required in the type of `dest`
  --> $DIR/missing-lifetimes-in-signature.rs:73:5
   |
LL |   fn bat<'a, G: 'a, T>(g: G, dest: &mut T) -> impl FnOnce() + '_ + 'a
   |                                    ------ help: add explicit lifetime `'a` to the type of `dest`: `&'a mut T`
...
LL | /     move || {
LL | |
LL | |
LL | |         *dest = g.get();
LL | |     }
   | |_____^ lifetime `'a` required

error[E0309]: the parameter type `G` may not live long enough
  --> $DIR/missing-lifetimes-in-signature.rs:85:5
   |
LL |   fn bak<'a, G, T>(g: G, dest: &'a mut T) -> impl FnOnce() + 'a
   |          -- the parameter type `G` must be valid for the lifetime `'a` as defined here...
...
LL | /     move || {
LL | |
LL | |         *dest = g.get();
LL | |     }
   | |_____^ ...so that the type `G` will meet its required lifetime bounds
   |
help: consider adding an explicit lifetime bound
   |
LL |     G: Get<T> + 'a,
   |               ++++

error: aborting due to 8 previous errors; 1 warning emitted

Some errors have detailed explanations: E0261, E0309, E0311, E0621, E0700.
For more information about an error, try `rustc --explain E0261`.