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Trait from different versions, why it works? - help - The Rust Programming Language Forum
https://users.rust-lang.org/t/trait-from-different-versions-why-it-works/38840
名前を出しているわけではないんだけどどう考えても num-traits crate のことを言ってるっぽいのがヒシヒシと伝わってきたので笑ってしまった (文脈)
users.rust-lang.orgTrait from different versions, why it works?Let's say I have crates: A, B and main. A depends on crate mega_traits 0.1.1 B depends on crate mega_traits 0.2.1 main depends on A and B and mega_traits 0.2.1. In A there is type: struct A; impl mega_traits::Trait for A {} and in main fn f<X: mega_traits::Trait>(x: X) {} f(A::A); and this code compiles and works without problelm. Why? Cargo.lock for main contains both version of mega_traits. So A::A implements mega_traits@0.1.1::Trait, while main::f requires mega_traits@0.2.1::Trait....
「ｱｯこれは」と思っちゃったよね