Internal compiler error casting to trait type twice

I accidentally had something like stdout() as io::Writer and got an ICE, but it also happens with trivial traits/trait impls like this:

trait Foo {}
impl (): Foo {}

fn main() {
    let _a = () as Foo as Foo;
}

rustc just errors out with an unexpected failure, and says

rust: task failed at 'get_vtable: expected a static origin', /home/ben/code/repos/rust/src/rustc/middle/trans/meth.rs:507

Looks like I just ran into this too...

Bumping to 0.7

Can't reproduce this anymore. Maybe it went away when sigils started being required for object-boxing?

Fix `cast_lossless` to avoid warning on `usize` to `f64` conversion.

Auto merge of rust-lang#8778 - sunfishcode:main, r=giraffate

Auto merge of rust-lang#3689 - adwinwhite:lseek64, r=RalfJung

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