Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2021-02-09 20:16 296899eb

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refactor(data/string/basic): simplify proof of to_list_nonempty (#6117) Co-authors: lean-gptf, Stanislas Polu This was found by formal-lean-wm-to-tt-m1-m2-v4-c4 when we evaluated it on theorems added to mathlib after we last extracted training data.

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