Support Cow<'static, str> for Readable

[benruijl]

I have a struct that contains a Cow<'static, str> member. This struct cannot implement Readable at the moment, since Readable is not able to create a borrow that is static. Would it be possible to make Readable create an owned clone of the string in this case?

[koute]

Yes, that could be special-cased inside of the derive macro.

[naomijub]

Wouldn't it be better to implement the trait manually in this case? It seems a very special case with possible different intents

[koute]

Wouldn't it be better to implement the trait manually in this case? It seems a very special case with possible different intents

You'd have to implement the trait for the whole struct, which is not very ergonomic. An actually viable alternative would be to make a newtype (e.g. StaticCowStr) and manually implement the train yourself only on that. But I think it wouldn't be a bad idea to make Cow<'static, str> work by default anyway.

[naomijub]

In the past I've done the new type strategy for um implemented traits on types. Mostly works and is flex according to the demanded solution