`borrowing` + `sending` not allowed?

[Jumhyn (Frederick Kellison-Linn)]

Ah, if the proposal hasn’t been updated, that’s an error. This proposal was accepted with modifications:

@beccadax

A few reviewers also brought up the combination of the borrowing and sending modifiers. As proposed, this combination would have served a niche use case for ABI-stable retroactive adopters of sending, but some reviewers argued that it would be a good spelling for a future direction that allowed the callee to "borrow" a region for the duration of the call while promising to keep it intact. To avoid prematurely precluding this design, the Language Steering Group has chosen to ban the combination of borrowing and sending; when the standard library adopts sending, it will instead use a temporary compiler-internal facility to preserve ABI compatibility.