diff options
| -rw-r--r-- | tests/ui/traits/object/object-unsafe-missing-assoc-type.rs | 7 | ||||
| -rw-r--r-- | tests/ui/traits/object/object-unsafe-missing-assoc-type.stderr | 18 |
2 files changed, 25 insertions, 0 deletions
diff --git a/tests/ui/traits/object/object-unsafe-missing-assoc-type.rs b/tests/ui/traits/object/object-unsafe-missing-assoc-type.rs new file mode 100644 index 00000000000..21f7fd92e80 --- /dev/null +++ b/tests/ui/traits/object/object-unsafe-missing-assoc-type.rs @@ -0,0 +1,7 @@ +trait Foo { + type Bar<T>; +} + +fn bar(x: &dyn Foo) {} //~ ERROR the trait `Foo` cannot be made into an object + +fn main() {} diff --git a/tests/ui/traits/object/object-unsafe-missing-assoc-type.stderr b/tests/ui/traits/object/object-unsafe-missing-assoc-type.stderr new file mode 100644 index 00000000000..fcaa583e2bd --- /dev/null +++ b/tests/ui/traits/object/object-unsafe-missing-assoc-type.stderr @@ -0,0 +1,18 @@ +error[E0038]: the trait `Foo` cannot be made into an object + --> $DIR/object-unsafe-missing-assoc-type.rs:5:16 + | +LL | fn bar(x: &dyn Foo) {} + | ^^^ `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-unsafe-missing-assoc-type.rs:2:10 + | +LL | trait Foo { + | --- this trait cannot be made into an object... +LL | type Bar<T>; + | ^^^ ...because it contains the generic associated type `Bar` + = help: consider moving `Bar` to another trait + +error: aborting due to previous error + +For more information about this error, try `rustc --explain E0038`. |