compile error with BoxAny::downcast::<str>

[mandel59]

use std::any::Any;
use std::boxed::BoxAny;

fn main() {
    let x: Box<Any> = box "rust";
    match x.downcast::<str>() {
        Ok(s) => println!("str: {}", s),
        Err(x) => println!("{}", x)
    }
}

on rustc 0.13.0-dev (260e46115 2015-01-04 16:36:41 +0000) this yields:

issue.rs:6:13: 6:30 error: the trait `core::kinds::Sized` is not implemented for the type `str`
issue.rs:6     match x.downcast::<str>() {
                       ^~~~~~~~~~~~~~~~~
error: aborting due to previous error

[sfackler]

x is storing a &'static str, not a str. This works as expected:

use std::any::Any;
use std::boxed::BoxAny;

fn main() {
    let x: Box<Any> = box "rust";
    match x.downcast::<&'static str>() {
        Ok(s) => println!("str: {}", s),
        Err(x) => println!("{}", x)
    }
}

[mandel59]

Ah, i mistook it. Thank you for your advice 😄