diff options
Diffstat (limited to 'src/test/ui/object-safety/object-safety-no-static.object_safe_for_dispatch.stderr')
| -rw-r--r-- | src/test/ui/object-safety/object-safety-no-static.object_safe_for_dispatch.stderr | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/test/ui/object-safety/object-safety-no-static.object_safe_for_dispatch.stderr b/src/test/ui/object-safety/object-safety-no-static.object_safe_for_dispatch.stderr new file mode 100644 index 000000000..ea1c575ff --- /dev/null +++ b/src/test/ui/object-safety/object-safety-no-static.object_safe_for_dispatch.stderr @@ -0,0 +1,27 @@ +error[E0038]: the trait `Foo` cannot be made into an object + --> $DIR/object-safety-no-static.rs:22:27 + | +LL | let b: Box<dyn Foo> = Box::new(Bar); + | ^^^^^^^^^^^^^ `Foo` cannot be made into an object + | +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> + --> $DIR/object-safety-no-static.rs:9:8 + | +LL | trait Foo { + | --- this trait cannot be made into an object... +LL | fn foo() {} + | ^^^ ...because associated function `foo` has no `self` parameter + = note: required because of the requirements on the impl of `CoerceUnsized<Box<dyn Foo>>` for `Box<Bar>` + = note: required by cast to type `Box<dyn Foo>` +help: consider turning `foo` into a method by giving it a `&self` argument + | +LL | fn foo(&self) {} + | +++++ +help: alternatively, consider constraining `foo` so it does not apply to trait objects + | +LL | fn foo() where Self: Sized {} + | +++++++++++++++++ + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0038`. |