ices/43924.rs: fixed with errors

[github-actions]

Issue: rust-lang/rust#43924

#![feature(associated_type_defaults)] 
trait Foo < T : Default + ToString >
{ 
  type Out : Default + ToString = ToString; 
}

impl Foo < u32 > for () {} 
impl Foo < u64 > for () {}

fn main ()
{ 
  assert_eq ! (< () as Foo < u32 >> :: Out :: default().to_string(), "false"); 
} 

=== stdout ===
=== stderr ===
warning: trait objects without an explicit `dyn` are deprecated
 --> /home/runner/work/glacier/glacier/ices/43924.rs:4:35
  |
4 |   type Out : Default + ToString = ToString; 
  |                                   ^^^^^^^^ help: use `dyn`: `dyn ToString`
  |
  = note: `#[warn(bare_trait_objects)]` on by default

error[E0277]: the size for values of type `(dyn std::string::ToString + 'static)` cannot be known at compilation time
 --> /home/runner/work/glacier/glacier/ices/43924.rs:4:3
  |
2 | trait Foo < T : Default + ToString >
  | ------------------------------------ required by `Foo`
3 | { 
4 |   type Out : Default + ToString = ToString; 
  |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
  |
  = help: the trait `std::marker::Sized` is not implemented for `(dyn std::string::ToString + 'static)`
  = note: to learn more, visit <https://doc.rust-lang.org/book/ch19-04-advanced-types.html#dynamically-sized-types-and-the-sized-trait>

error[E0277]: the trait bound `(dyn std::string::ToString + 'static): std::default::Default` is not satisfied
 --> /home/runner/work/glacier/glacier/ices/43924.rs:4:14
  |
2 | trait Foo < T : Default + ToString >
  | ------------------------------------ required by `Foo`
3 | { 
4 |   type Out : Default + ToString = ToString; 
  |              ^^^^^^^ the trait `std::default::Default` is not implemented for `(dyn std::string::ToString + 'static)`

error[E0277]: the trait bound `(dyn std::string::ToString + 'static): std::default::Default` is not satisfied
 --> /home/runner/work/glacier/glacier/ices/43924.rs:7:6
  |
7 | impl Foo < u32 > for () {} 
  |      ^^^^^^^^^^^ the trait `std::default::Default` is not implemented for `(dyn std::string::ToString + 'static)`

error[E0277]: the trait bound `(dyn std::string::ToString + 'static): std::default::Default` is not satisfied
 --> /home/runner/work/glacier/glacier/ices/43924.rs:8:6
  |
8 | impl Foo < u64 > for () {}
  |      ^^^^^^^^^^^ the trait `std::default::Default` is not implemented for `(dyn std::string::ToString + 'static)`

error: aborting due to 4 previous errors

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