assignment of statement expressions crashes compiler

[jorgeadriano]

According to the manual, "an expression statement is one that evaluates an expression and ignores its result. The type of an expression statement e; is always ()"

However assignments of the form,

let x = {e;}; 

cause the compiler to crash. Likewise with struct field assignments,

S {x: {e;}};

Self-contained example program:

struct S {x:()}

fn main(){

    // crashes the compiler
    let s : S  = S{x: {println!("a");} }; //

    // crashes the compiler
    let x : () = {println!("a");};

    // note the following works
    let y : int = {0};

    // as does
    let z : () = { {println!("a");} ; ()}; 
}

[huonw]

Closing as a dupe of #11709.