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error[E0038]: the trait `Tr` is not dyn compatible
--> $DIR/safety.rs:15:17
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LL | let _: &dyn Tr = &St;
| ^^ `Tr` is not dyn compatible
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note: for a trait to be dyn compatible it needs to allow building a vtable
for more information, visit <https://doc.rust-lang.org/reference/items/traits.html#dyn-compatibility>
--> $DIR/safety.rs:4:8
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LL | trait Tr {
| -- this trait is not dyn compatible...
LL | fn foo();
| ^^^ ...because associated function `foo` has no `self` parameter
= help: only type `St` implements `Tr`; consider using it directly instead.
help: consider turning `foo` into a method by giving it a `&self` argument
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LL | fn foo(&self);
| +++++
help: alternatively, consider constraining `foo` so it does not apply to trait objects
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LL | fn foo() where Self: Sized;
| +++++++++++++++++
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0038`.
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