``` help: consider restricting type parameter `T` with traits `Copy` and `Trait` | LL | fn duplicate_custom<T: Copy + Trait>(t: S<T>) -> (S<T>, S<T>) { | ++++++++++++++ ``` ``` help: consider restricting type parameter `V` with trait `Copy` | LL | fn index<'a, K, V: std::marker::Copy>(map: &'a HashMap<K, V>, k: K) -> &'a V { | +++++++++++++++++++ ```
-Znext-solver=coherence