Struct inheritance goes wrong for unit-like and tuple structs

[ben0x539]

This compiles and segfaults (or anyway prints weird values):

#![feature(struct_inherit)]

virtual struct Foo {
    x: Box<int>
}

struct Bar : Foo;

fn main() {
    println!("{}", Bar.x);
}

An inheriting tuple struct (surprisingly spelled eg. struct Bar : Foo (int, int); too!) also compiles and does broken things.

Edit: The other way around is probably also wrong, with a non-record-like base struct.

[emberian]

cc @nick29581

[ghost]

Struct inheritance has been removed, closing.