Remove B: Buf bound on SendStream's parameter

[djkoloski]

This bound is only necessary when calling methods on SendStream because we don't use any associated types of B's Buf impl in the type. Relaxing this bound allows us to construct SendStreams with non-Buf B (though we can't do anything with them).

[djkoloski]

#616 should fix the nightly CI.

[seanmonstar]

(though we can't do anything with them).

Is this beneficial somehow? I'd love to understand the goal.

[djkoloski]

Sorry, I didn't put enough context in here. hyperium/hyper#2830 contains some work to remove a transmute from hyper. Rather than write new Buf impls with unreachable!, I figured we could clean things up bit by relaxing the bounds in h2. That way we don't have to write uncallable Buf impls with impossible methods. It's not very important, but it does help with code quality downstream.

[djkoloski]

Bumping this after #616 was merged.

[LucioFranco]

This seems fine to me, I prefer to not have the bounds on the struct anyways. Also, I don't think this is breaking so I think we are fine to merge?

[djkoloski]

Quick bump on this, if there are no objections I think this would be a good improvement. 🙂

[LucioFranco]

Oh sorry, we can get this merged :D