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+error[E0038]: the trait `Bar` cannot be made into an object
+ --> $DIR/issue-72410.rs:14:19
+ |
+LL | where for<'a> &'a mut [dyn Bar]: ;
+ | ^^^^^^^^^^^^^^^^^ `Bar` 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/issue-72410.rs:13:8
+ |
+LL | pub trait Bar {
+ | --- this trait cannot be made into an object...
+LL | fn map()
+ | ^^^ ...because associated function `map` has no `self` parameter
+help: consider turning `map` into a method by giving it a `&self` argument
+ |
+LL | fn map(&self)
+ | +++++
+help: alternatively, consider constraining `map` so it does not apply to trait objects
+ |
+LL | where for<'a> &'a mut [dyn Bar]:, Self: Sized ;
+ | +++++++++++++
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0038`.