> If A pins version <= X of dependency B, but C depends on B > X, component D can include both A & C as dependencies & it will still build & work correctly. Ac

> If A pins version <= X of dependency B, but C depends on B > X, component D can include both A & C as dependencies & it will still build & work correctly. Actually, I believe that's only true if the two versions of Bs have semver-incompatible version numbers. So, for instance, if your dependency A requests B=1.5 and C requests B=2.3, then cargo will do what you say and compile both versions separately. But if A requests B=1.3 and C requests B=1.4, cargo will try to find the highest semver-compatible version that satisfies both constraints. If A pins B<=1.3 and C pins B>1.4, cargo will give you an error. https://doc.rust-lang.org/cargo/reference/resolver.html https://doc.rust-lang.org/cargo/reference/resolver.html