feat: add Std.Data.List.SplitOnList
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Move a theorem from `Mathlib.Data.List.Basic` to Std.
* `List.splitOnceP` returns `(l₁, l₂)` for the first split `l = l₁ ++ l₂` such that `P l₂` returns true. * `List.splitOnList` splits a list at every occurrence of a separator list. The separators are not in the result. Co-authored-by: Mario Carneiro <di.gama@gmail.com>
Co-authored-by: Scott Morrison <scott.morrison@gmail.com>
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Mathlib.Data.List.Basicto Std.List.isPrefixOfandList.isSuffixOf.Std.Data.List.SplitOnList.List.splitOnListis a specification forString.splitOn. We need it to proveString.splitOn_of_valid, which is on the to-do list inStd.Data.String.Lemmas.Co-authored-by: Mario Carneiro di.gama@gmail.com
Co-authored-by: Scott Morrison scott.morrison@gmail.com
See #495 for more context.