Can't cast char to char

[veddan]

All other types can be cast to themselves just fine, but trying to compile

fn main() {
    let a = 'c';
    let b = a as char;
}

gives

bug.rs:3:13: 3:22 error: only `u8` can be cast as `char`, not `char`
bug.rs:3     let b = a as char;
                     ^~~~~~~~~
error: aborting due to previous error

[thestinger]

This also gives an error for any type that's not one of the numeric built-in types. I don't think it needs to be supported. Making as smaller rather than larger would be nice as it's one of the ugly special cases in the language.

[thestinger]

I think allowing T as T would need to go through an RFC now. I only see as as a temporary hack that's necessary due to constant expressions being crippled though.