Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
da91aed2e2
This PR verifies the `String.dropWhile` and `String.takeWhile` functions. It also includes a refactor of the `PatternModel` class so that the `not_matches_empty` condition is moved into a separate typeclass `StrictPatternModel`. This allows string patterns to implement `LawfulForwardPatternModel` unconditionally, which means that more of the general theory about patterns directly applies to string patterns without having to do a case distinction for empty strings. This PR also includes a study of the `PatternModel` machinery given to slices `s` and `t` such that `s.copy = t.copy`. From these results, we deduce statements like `s.copy.startsWith pat = s.startsWith pat` (which is far from obvious!). |
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