The return type http_body_util::Collected::aggregate is unnamable

[MOZGIII]

pub fn aggregate(self) -> impl Buf {
    self.bufs
}

Can we turn impl Buf into a namable type (BufList<B>)? It is nice to use impl Buf and all, but today it makes it impossible to use it as a trait associated type.

Example:

trait Bufferer {
    type Data: bytes::Buf;

    // ...
}

impl<B> Bufferer for Collected<B> {
    type Data = ?; // can't just `impl Buf` now
}

[seanmonstar]

Yes, it is unnameable. It should eventually be possible to use ATPIT, and in the meantime it's possible to box the type, or convert it into a different one (like copy_to_bytes).

[MOZGIII]

Thx for the reply! Yep, both solutions work. I can't decide for myself which one to use now, so I now have an overengineered a solution on my end of the code to support both variants...

Can I ask why is the API like this in the first place? It is quite obvious doing this today before rust fully support referring to existential types creates a needless burden for the end user. There is an obvious solution to the problem - that is to just use a nameable type there. Not sure what is the benefit here, but it does make people waste time working around this issue.

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UPD: also, should I make a PR to change the impl Buf to a named type?