error[E0277]: the size for values of type `(dyn Foo + 'static)` cannot be known at compilation time
  --> $DIR/feature-gate-unsized_fn_params.rs:17:8
   |
LL | fn foo(x: dyn Foo) {
   |        ^ doesn't have a size known at compile-time
   |
   = help: the trait `Sized` is not implemented for `(dyn Foo + 'static)`
   = help: unsized fn params are gated as an unstable feature
help: function arguments must have a statically known size, borrowed types always have a known size
   |
LL | fn foo(x: &dyn Foo) {
   |           +

error[E0277]: the size for values of type `(dyn Foo + 'static)` cannot be known at compilation time
  --> $DIR/feature-gate-unsized_fn_params.rs:24:9
   |
LL |     foo(*x);
   |         ^^ doesn't have a size known at compile-time
   |
   = help: the trait `Sized` is not implemented for `(dyn Foo + 'static)`
   = help: unsized fn params are gated as an unstable feature
help: function arguments must have a statically known size, borrowed types always have a known size
   |
LL |     foo(&*x);
   |         +

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0277`.