r? @matklad

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Thanks for the PR! In light of https://internals.rust-lang.org/t/cargo-and-rustup-development/8615/1 I don't think we're willing to merge this at this time. This is changing a very longstanding interface in Cargo which I unfortunately think we don't have ti,e to prioritize and review until after the edition and planning.

Yeah, no worries. It was a small change (from an input-work perspective) and I don't think it's high priority or anything that would warrant taking time away from larger issues right now.

Ok sure thing, would you be ok closing this in the meantime?

Yeah, there's still the issue to track the request so no reason this has to sit around taking up space.

@alexcrichton I see why this should not be merged during the features-freeze, but I am strongly in favor of this change in general.

Reopening this now that we're past the feature freeze that prevented serious discussion initially.

Ugh, I merged instead of rebased this because I'm a moron and forget how to git. I'll clean up the mess and probably just open another PR. Ignore me.