bors d38e8a05b5 Auto merge of #26963 - Manishearth:improve-diag, r=steveklabnik
I'll be adding more commits to this PR as the weekend progresses. Was hoping to make this a mega-PR, but getting some eyes on this early would be nice too.

r? @steveklabnik

r? @eddyb on the object safety bits

cc @michaelsproul

Part of #24407
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