[rust-dev] type annotaion of &mut

[Taku Masa]

This is very simple code about mutable borrow.

code1 is compiled, but code2 is not compiled.
difference of them is `let b` has explicit type-annotation or not.
In this case, why is explicit annotation needed?

//code1
fn main(){
    let a = &mut 10i;

    {
        let b:&mut int = a;
        *b = 11i;
    }

    println!("{}",a);
}

//code2
fn main(){
    let a = &mut 10i;

    {
        let b = a;
        *b = 11i;
    }

    println!("{}",a);
}

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