Poor error message for pointer patterns with trait objects

[huonw]

trait Foo {}
impl Foo for int {}

fn main() {
    let ~x = ~1 as ~Foo;
    let &x = &1 as &Foo;
}

trait-object-pattern.rs:5:9: 5:11 error: mismatched types: expected `~Foo:Send` but found a ~-box pattern
trait-object-pattern.rs:5     let ~x = ~1 as ~Foo;
                                  ^~
trait-object-pattern.rs:6:9: 6:11 error: mismatched types: expected `&Foo<no-bounds>` but found an &-pointer pattern
trait-object-pattern.rs:6     let &x = &1 as &Foo;
                                  ^~

The error message doesn't make it obvious what the type mismatch is, since ~Foo:Send certainly appears to satisfy a ~-box pattern.

[jfager]

~ is gone; the updated version

trait Foo {}
impl Foo for int {}

fn main() {
    let box x = box 1i as Box<Foo>;
    let &x = &1i as &Foo;
}

now errors with

$ rustc r11469.rs 
r11469.rs:5:9: 5:14 error: type `Box<Foo>` cannot be dereferenced [E0033]
r11469.rs:5     let box x = box 1i as Box<Foo>;
                    ^~~~~
r11469.rs:6:9: 6:11 error: type `&Foo` cannot be dereferenced [E0033]
r11469.rs:6     let &x = &1i as &Foo;
                    ^~
error: aborting due to 2 previous errors

[ghost]

@jfager Thanks, this has indeed improved and it's tested (src/test/compile-fail/destructure-trait-ref.rs) so I'm closing the issue.