Looks like Legion 0.3.0 is not compiling with Rust 1.49.0. Legion 0.3.1 appears OK so far.

That’s odd! It compiled with 1.49.0 ok on my Windows (64-bit) system (I’ll try Linux in a bit, still finding coffee). What platform are you using?

Thanks! I still can’t replicate it on Windows, but my Linux box showed me an issue. Must be in some platform-specific code somewhere. I’ve updated the book to 0.3.1 and it works solidly for me.