Empty struct incorrectly becomes void in varargs functions

[tgschultz]

const Empty = struct {};
fn foo(args:...) void {
    var e: Empty = args[0];
}
test "Empty" {
    foo(Empty(undefined));
}

error: expected type 'Empty', found 'void'
    var e: Empty = args[0];
                       ^

Should be fixed by #208 .

[andrewrk]

Updated test which passes:

const Empty = struct {};
fn foo(args: var) void {
    var e: Empty = args[0];
}
test "Empty" {
    foo(.{@as(Empty, undefined)});
}

var args removed from the language in a3f6a58