Fix build for Rust 1.0

[bombless]

I think what they do in nalgebra is kinda weird because we already have associated types, but anyway this fix the build for stable Rust.

[sebcrozet]

Thanks, but, what version of rustc are you using exactly ? I'm currently running rust stable 1.0 (rustc 1.0.0 (a59de37e9 2015-05-13) (built 2015-05-14) and ncollide compiles without this patch.

nalgebra does some weird things with associated types (and sometimes does not use them) because they are not yet completely supported by the compiler: I get ICEs when I try to use them.

[bombless]

I don't know, but maybe you should try cargo clean && cargo build, see #78

I don't have strong opinion on this, I just saw people talking about not able to build it on IRC and come to see what I can do.

I use rustc compiled from master branch pulled one day ago by the way.

[bombless]

I see, maybe the break come from nalgebra.
Then we can designate the version of nalgebra in Cargo.toml, if it do sane vesioning.

EDIT: typo

[sebcrozet]

I don't recommend people to use the master branch of the compiler or even the nightlies. I believe the common approach now is to stay with the latest stable releases.

[bombless]

btw, if you are using low version of nalgebra, you may need cargo update to reproduce the problem, see https://crates.io/crates/nalgebra

[bombless]

tl;dr: check if you are using nalgebra 0.2.17

[bombless]

@sebcrozet I'm very sorry that I didn't check it carefully.
Already filed an issue for it, rust-lang/rust#26279