error: lifetime may not live long enough --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:6:5 | LL | fn change_lt<'a, 'b>(x: *mut dyn Trait<'a>) -> *mut dyn Trait<'b> { | -- -- lifetime `'b` defined here | | | lifetime `'a` defined here LL | x as _ | ^^^^^^ function was supposed to return data with lifetime `'a` but it is returning data with lifetime `'b` | = help: consider adding the following bound: `'b: 'a` = note: requirement occurs because of a mutable pointer to `dyn Trait<'_>` = note: mutable pointers are invariant over their type parameter = help: see for more information about variance error: lifetime may not live long enough --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:6:5 | LL | fn change_lt<'a, 'b>(x: *mut dyn Trait<'a>) -> *mut dyn Trait<'b> { | -- -- lifetime `'b` defined here | | | lifetime `'a` defined here LL | x as _ | ^^^^^^ function was supposed to return data with lifetime `'b` but it is returning data with lifetime `'a` | = help: consider adding the following bound: `'a: 'b` = note: requirement occurs because of a mutable pointer to `dyn Trait<'_>` = note: mutable pointers are invariant over their type parameter = help: see for more information about variance help: `'b` and `'a` must be the same: replace one with the other error: lifetime may not live long enough --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:11:5 | LL | fn change_lt_ab<'a: 'b, 'b>(x: *mut dyn Trait<'a>) -> *mut dyn Trait<'b> { | -- -- lifetime `'b` defined here | | | lifetime `'a` defined here LL | x as _ | ^^^^^^ function was supposed to return data with lifetime `'a` but it is returning data with lifetime `'b` | = help: consider adding the following bound: `'b: 'a` = note: requirement occurs because of a mutable pointer to `dyn Trait<'_>` = note: mutable pointers are invariant over their type parameter = help: see for more information about variance error: lifetime may not live long enough --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:15:5 | LL | fn change_lt_ba<'a, 'b: 'a>(x: *mut dyn Trait<'a>) -> *mut dyn Trait<'b> { | -- -- lifetime `'b` defined here | | | lifetime `'a` defined here LL | x as _ | ^^^^^^ function was supposed to return data with lifetime `'b` but it is returning data with lifetime `'a` | = help: consider adding the following bound: `'a: 'b` = note: requirement occurs because of a mutable pointer to `dyn Trait<'_>` = note: mutable pointers are invariant over their type parameter = help: see for more information about variance error: lifetime may not live long enough --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:19:5 | LL | fn change_lt_hr<'a>(x: *mut dyn Trait<'a>) -> *mut dyn for<'b> Trait<'b> { | -- lifetime `'a` defined here LL | x as _ | ^^^^^^ cast requires that `'a` must outlive `'static` | help: to declare that the trait object captures data from argument `x`, you can add an explicit `'a` lifetime bound | LL | fn change_lt_hr<'a>(x: *mut dyn Trait<'a>) -> *mut dyn for<'b> Trait<'b> + 'a { | ++++ error[E0308]: mismatched types --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:19:5 | LL | x as _ | ^^^^^^ one type is more general than the other | = note: expected trait object `dyn for<'b> Trait<'b>` found trait object `dyn Trait<'_>` error: lifetime may not live long enough --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:31:5 | LL | fn change_assoc_0<'a, 'b>( | -- -- lifetime `'b` defined here | | | lifetime `'a` defined here ... LL | x as _ | ^^^^^^ function was supposed to return data with lifetime `'a` but it is returning data with lifetime `'b` | = help: consider adding the following bound: `'b: 'a` = note: requirement occurs because of a mutable pointer to `dyn Assocked` = note: mutable pointers are invariant over their type parameter = help: see for more information about variance error: lifetime may not live long enough --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:31:5 | LL | fn change_assoc_0<'a, 'b>( | -- -- lifetime `'b` defined here | | | lifetime `'a` defined here ... LL | x as _ | ^^^^^^ function was supposed to return data with lifetime `'b` but it is returning data with lifetime `'a` | = help: consider adding the following bound: `'a: 'b` = note: requirement occurs because of a mutable pointer to `dyn Assocked` = note: mutable pointers are invariant over their type parameter = help: see for more information about variance help: `'b` and `'a` must be the same: replace one with the other | = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no` error: lifetime may not live long enough --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:38:5 | LL | fn change_assoc_1<'a, 'b>( | -- -- lifetime `'b` defined here | | | lifetime `'a` defined here ... LL | x as _ | ^^^^^^ function was supposed to return data with lifetime `'a` but it is returning data with lifetime `'b` | = help: consider adding the following bound: `'b: 'a` = note: requirement occurs because of a mutable pointer to `dyn Assocked>` = note: mutable pointers are invariant over their type parameter = help: see for more information about variance error: lifetime may not live long enough --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:38:5 | LL | fn change_assoc_1<'a, 'b>( | -- -- lifetime `'b` defined here | | | lifetime `'a` defined here ... LL | x as _ | ^^^^^^ function was supposed to return data with lifetime `'b` but it is returning data with lifetime `'a` | = help: consider adding the following bound: `'a: 'b` = note: requirement occurs because of a mutable pointer to `dyn Assocked>` = note: mutable pointers are invariant over their type parameter = help: see for more information about variance help: `'b` and `'a` must be the same: replace one with the other | = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no` error: lifetime may not live long enough --> $DIR/ptr-to-trait-obj-different-regions-misc.rs:45:20 | LL | fn extend_to_static<'a>(ptr: *const dyn Trait<'a>) { | -- lifetime `'a` defined here LL | require_static(ptr as _) | ^^^^^^^^ cast requires that `'a` must outlive `'static` error: aborting due to 11 previous errors For more information about this error, try `rustc --explain E0308`.