Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2020-09-03 00:15 7b9db99c

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fix(test/*): make sure tests produce no output (#3947) Modify tests so that they produce no output. This also means removing all uses of sorry/admit. Replace #eval by run_cmd consistently. Tests that produced output before are modified so that it is checked that they roughly produce the right output Add a trace option to the #simp command that turns the message of only if the expression is simplified to true. All tests are modified so that they simplify to true. The randomized tests can produce output when they find a false positive, but that should basically never happen. Add some docstings to src/tactic/interactive.

Estimated changes

modified theorem T.zero_lt_one
modified theorem abs_nonneg'