remove semicolon for suppressed the expressions to unit

[He-Pin]

Hi I am new to rust,and when I am reading examples from rust by example,I found this one is really confusing.

This may not always be desired, so the output can be suppressed by ending the expression with a semicolon ;

why not just make the return type as unit,then the return type of the expression just been ignored just like scala.

[steveklabnik]

Please open an issue on Rust by Example, rather than on Rust itself.

[He-Pin]

this is the rust issue.
I would like to write

 let z:()= {
        // The semicolon suppresses this expression and `()` is assigned to `z`
        2 * x
    }

or

 let z= {
        // The semicolon suppresses this expression and `()` is assigned to `z`
        2 * x
      ()
    }

[steveklabnik]

If you're interested in changing the semantics of the language, then the appropriate venue is https://github.com/rust-lang/rfcs , as all significant semantics must go through one.

[He-Pin]

@steveklabnik thanks ,very open and nice.