GitLab

For the Rust GhostCell paper, we designed and @pythonsq implemented a "reservation map" RA that is useful when one needs to synchronously reserve two equal names in two different abstractions.

1. The reservation map lets you reserve an infinite amount of names in a first frame-preserving update.
2. Next you can use that infinite set to reserve a particular name in some other abstraction, with the usual "strong allocation" lemma that picks the new name from any infinite set.
3. Finally you can take that one name you got, and since it is in the infinite set you reserved, you may now own that name in the reservation map after a second frame-preserving update.

The code for this is at https://gitlab.mpi-sws.org/FP/ghostcell/-/blob/master/theories/typing/lib/gsingleton.v. @pythonsq do you think you will have time to clean this up and make it into an MR?