Doesn't enforce divergence

[CAD97]

Will need to change

let_match_macro/let_match_macro/src/lib.rs

Line 51 in ebbdd09

#(#matches)*

into something along the lines of

    #(#arm_pat => {
        let _: ! = #arm_expr;
    })*

[pierzchalski]

Fixed in 620a764.