> Your clients don't though, you can have multiple versions of a crate in your build tree Yes, but you can only directly depend on one version of failure. Wha

> Your clients don't though, you can have multiple versions of a crate in your build tree Yes, but you can only directly depend on one version of failure. What happens if you directly depend on two libraries with different versions of failure? How do you interop with them? In a lot of cases, you'll be lucky and not need to reference the types in any way and it will "just work". This breaks down if you do need to reference the types.