fmt!'s pretty printer dies on vectors of unit struct

fn main() {
    struct Foo;
    let x = ~[Foo, Foo, Foo];
    println(fmt!("%?", x));
    // hangs, gobbles up memory
}

I'd guess this is somehow linked to unit structs being 0 sized.

Don't loop infinitely on 0-size structs in repr

auto merge of #7683 : alexcrichton/rust/issue-7625, r=thestinger

Auto merge of rust-lang#7646 - camsteffen:relative-target, r=flip1995

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