src/test/ui/feature-gates/feature-gate-object_safe_for_dispatch.stderr

   1 error[E0038]: the trait `NonObjectSafe1` cannot be made into an object
   2   --> $DIR/feature-gate-object_safe_for_dispatch.rs:18:39
   3    |
   4 LL | fn takes_non_object_safe_ref<T>(obj: &dyn NonObjectSafe1) {
   5    |                                       ^^^^^^^^^^^^^^^^^^ `NonObjectSafe1` cannot be made into an object
   6    |
   7 note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
   8   --> $DIR/feature-gate-object_safe_for_dispatch.rs:4:23
   9    |
  10 LL | trait NonObjectSafe1: Sized {}
  11    |       --------------  ^^^^^ ...because it requires `Self: Sized`
  12    |       |
  13    |       this trait cannot be made into an object...
  14
  15 error[E0038]: the trait `NonObjectSafe2` cannot be made into an object
  16   --> $DIR/feature-gate-object_safe_for_dispatch.rs:22:36
  17    |
  18 LL | fn return_non_object_safe_ref() -> &'static dyn NonObjectSafe2 {
  19    |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^ `NonObjectSafe2` cannot be made into an object
  20    |
  21 note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
  22   --> $DIR/feature-gate-object_safe_for_dispatch.rs:7:8
  23    |
  24 LL | trait NonObjectSafe2 {
  25    |       -------------- this trait cannot be made into an object...
  26 LL |     fn static_fn() {}
  27    |        ^^^^^^^^^ ...because associated function `static_fn` has no `self` parameter
  28 help: consider turning `static_fn` into a method by giving it a `&self` argument
  29    |
  30 LL |     fn static_fn(&self) {}
  31    |                  ^^^^^
  32 help: alternatively, consider constraining `static_fn` so it does not apply to trait objects
  33    |
  34 LL |     fn static_fn() where Self: Sized {}
  35    |                    ^^^^^^^^^^^^^^^^^
  36
  37 error[E0038]: the trait `NonObjectSafe3` cannot be made into an object
  38   --> $DIR/feature-gate-object_safe_for_dispatch.rs:27:39
  39    |
  40 LL | fn takes_non_object_safe_box(obj: Box<dyn NonObjectSafe3>) {
  41    |                                       ^^^^^^^^^^^^^^^^^^ `NonObjectSafe3` cannot be made into an object
  42    |
  43    = help: consider moving `foo` to another trait
  44 note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
  45   --> $DIR/feature-gate-object_safe_for_dispatch.rs:11:8
  46    |
  47 LL | trait NonObjectSafe3 {
  48    |       -------------- this trait cannot be made into an object...
  49 LL |     fn foo<T>(&self);
  50    |        ^^^ ...because method `foo` has generic type parameters
  51
  52 error[E0038]: the trait `NonObjectSafe4` cannot be made into an object
  53   --> $DIR/feature-gate-object_safe_for_dispatch.rs:31:35
  54    |
  55 LL | fn return_non_object_safe_rc() -> std::rc::Rc<dyn NonObjectSafe4> {
  56    |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `NonObjectSafe4` cannot be made into an object
  57    |
  58    = help: consider moving `foo` to another trait
  59 note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
  60   --> $DIR/feature-gate-object_safe_for_dispatch.rs:15:22
  61    |
  62 LL | trait NonObjectSafe4 {
  63    |       -------------- this trait cannot be made into an object...
  64 LL |     fn foo(&self, s: &Self);
  65    |                      ^^^^^ ...because method `foo` references the `Self` type in this parameter
  66
  67 error[E0038]: the trait `NonObjectSafe1` cannot be made into an object
  68   --> $DIR/feature-gate-object_safe_for_dispatch.rs:38:16
  69    |
  70 LL | impl Trait for dyn NonObjectSafe1 {}
  71    |                ^^^^^^^^^^^^^^^^^^ `NonObjectSafe1` cannot be made into an object
  72    |
  73 note: for a trait to be "object safe" it needs to allow building a vtable to allow the call to be resolvable dynamically; for more information visit <https://doc.rust-lang.org/reference/items/traits.html#object-safety>
  74   --> $DIR/feature-gate-object_safe_for_dispatch.rs:4:23
  75    |
  76 LL | trait NonObjectSafe1: Sized {}
  77    |       --------------  ^^^^^ ...because it requires `Self: Sized`
  78    |       |
  79    |       this trait cannot be made into an object...
  80
  81 error: aborting due to 5 previous errors
  82
  83 For more information about this error, try `rustc --explain E0038`.