@eddyb_r @Gankro Can we just make node_ids in rustc pseudorandom sequences to begin with and then make the hash the identity function? Do node_ids have to be sequential?
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NodeId's aren't used that much anymore. this approach would be interesting for DefId (which types also contain) though!
I've definitely thought about this for `DefId`. Actually I had planned to make a `DefId` be literally a cryptographic hash of its contents, I don't know that I had considered *random* hashes assigned on creation. The former persists across incremental sessions, which is nice.
