Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-11-21 19:57 3536f475

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feat(tactic/print_sorry): add #print_sorry_in command (#16911) Note: This command will happily print internal declarations like foo._proof_i. You could make it a bit nicer by not printing these as separate declarations, but the current version is already very useful, and I don't want to spend too much time on Lean 3 metaprogramming.

Estimated changes

added def foo1
added def foo2
added def foo3
added def foo4
added def foo5