[beta] Backport #67134#67297

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oli-obk wants to merge 2 commits intorust-lang:betafrom

oli-obk:const_prop_zst

Commits on Dec 14, 2019

Ensure that we get a hard error on generic ZST constants if their body causes an error during evaluation
oli-obk
committed
Show const_err lint in addition to the hard error
oli-obk
committed