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Diffstat (limited to 'src/test/ui/impl-trait/object-unsafe-trait-in-return-position-dyn-trait.stderr')
| -rw-r--r-- | src/test/ui/impl-trait/object-unsafe-trait-in-return-position-dyn-trait.stderr | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/src/test/ui/impl-trait/object-unsafe-trait-in-return-position-dyn-trait.stderr b/src/test/ui/impl-trait/object-unsafe-trait-in-return-position-dyn-trait.stderr new file mode 100644 index 000000000..365ecd9fc --- /dev/null +++ b/src/test/ui/impl-trait/object-unsafe-trait-in-return-position-dyn-trait.stderr @@ -0,0 +1,47 @@ +error[E0038]: the trait `NotObjectSafe` cannot be made into an object + --> $DIR/object-unsafe-trait-in-return-position-dyn-trait.rs:21:13 + | +LL | fn car() -> dyn NotObjectSafe { + | ^^^^^^^^^^^^^^^^^ `NotObjectSafe` 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-unsafe-trait-in-return-position-dyn-trait.rs:3:8 + | +LL | trait NotObjectSafe { + | ------------- this trait cannot be made into an object... +LL | fn foo() -> Self; + | ^^^ ...because associated function `foo` has no `self` parameter +help: consider turning `foo` into a method by giving it a `&self` argument + | +LL | fn foo(&self) -> Self; + | +++++ +help: alternatively, consider constraining `foo` so it does not apply to trait objects + | +LL | fn foo() -> Self where Self: Sized; + | +++++++++++++++++ + +error[E0038]: the trait `NotObjectSafe` cannot be made into an object + --> $DIR/object-unsafe-trait-in-return-position-dyn-trait.rs:28:13 + | +LL | fn cat() -> Box<dyn NotObjectSafe> { + | ^^^^^^^^^^^^^^^^^^^^^^ `NotObjectSafe` 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-unsafe-trait-in-return-position-dyn-trait.rs:3:8 + | +LL | trait NotObjectSafe { + | ------------- this trait cannot be made into an object... +LL | fn foo() -> Self; + | ^^^ ...because associated function `foo` has no `self` parameter +help: consider turning `foo` into a method by giving it a `&self` argument + | +LL | fn foo(&self) -> Self; + | +++++ +help: alternatively, consider constraining `foo` so it does not apply to trait objects + | +LL | fn foo() -> Self where Self: Sized; + | +++++++++++++++++ + +error: aborting due to 2 previous errors + +For more information about this error, try `rustc --explain E0038`. |