ICE: Associated types in struct definitions ICE in trans

[nikomatsakis]

Somebody is failing to normalize an associated type in trans somewhere.

Test case:

// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#![feature(associated_types)]

trait Test {
    type V;

    fn test(&self, value: &Self::V) -> bool;
}

///////////////////////////////////////////////////////////////////////////

struct TesterPair<T:Test> {
    tester: T,
    value: T::V,
}

impl<T:Test> TesterPair<T> {
    fn new(tester: T, value: T::V) -> TesterPair<T> {
        TesterPair { tester: tester, value: value }
    }

    fn test(&self) -> bool {
        self.tester.test(&self.value)
    }
}

///////////////////////////////////////////////////////////////////////////

struct EqU32(u32);
impl Test for EqU32 {
    type V = u32;

    fn test(&self, value: &u32) -> bool {
        self.0 == *value
    }
}

struct EqI32(i32);
impl Test for EqI32 {
    type V = i32;

    fn test(&self, value: &i32) -> bool {
        self.0 == *value
    }
}

fn main() {
    let tester = TesterPair::new(EqU32(22), 23);
    tester.test();
}

Yields:

error: internal compiler error: type_of with ty_projection
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
thread 'rustc' panicked at 'Box<Any>', /home/nmatsakis/versioned/rust-2/src/libsyntax/diagnostic.rs:182

[nikomatsakis]

I've fixed a lot of this, but it points at a somewhat deeper problem: TypeContents doesn't understand associated types yet. I'm pondering the best way to fix that.