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532c2b64d8
make field representing types invariant over the base type We probably don't want to have any subtype relationship between any FRTs. Reported-by: @dvdhrm "David Rheinsberg" <david@readahead.eu> Link: https://rust-for-linux.zulipchat.com/#narrow/channel/288089-General/topic/Multiple.20LockedBy.20with.20Single.20Lock/near/579275908 r? @oli-obk