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+error[E0277]: the size for values of type `<Self as Deref>::Target` cannot be known at compilation time
+ --> $DIR/issue-42312.rs:4:12
+ |
+LL | fn baz(_: Self::Target) where Self: Deref {}
+ | ^ doesn't have a size known at compile-time
+ |
+ = help: the trait `Sized` is not implemented for `<Self as Deref>::Target`
+ = help: unsized fn params are gated as an unstable feature
+help: consider further restricting the associated type
+ |
+LL | fn baz(_: Self::Target) where Self: Deref, <Self as Deref>::Target: Sized {}
+ | ++++++++++++++++++++++++++++++++
+help: function arguments must have a statically known size, borrowed types always have a known size
+ |
+LL | fn baz(_: &Self::Target) where Self: Deref {}
+ | +
+
+error[E0277]: the size for values of type `(dyn ToString + 'static)` cannot be known at compilation time
+ --> $DIR/issue-42312.rs:8:10
+ |
+LL | pub fn f(_: dyn ToString) {}
+ | ^ doesn't have a size known at compile-time
+ |
+ = help: the trait `Sized` is not implemented for `(dyn ToString + 'static)`
+ = help: unsized fn params are gated as an unstable feature
+help: you can use `impl Trait` as the argument type
+ |
+LL | pub fn f(_: impl ToString) {}
+ | ~~~~
+help: function arguments must have a statically known size, borrowed types always have a known size
+ |
+LL | pub fn f(_: &dyn ToString) {}
+ | +
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0277`.