It depends. Features are not unified with resolver = 2 for proc macros. https://doc.rust-lang.org/cargo/reference/resolver.html#features https://doc.rust-lang.

It depends. Features are not unified with resolver = 2 for proc macros. https://doc.rust-lang.org/cargo/reference/resolver.html#features https://doc.rust-lang.org/cargo/reference/resolver.html#feat... That said I'm not sure how that applies transitively, I could have sworn I've seen conflicting features not cause transitive build failures.