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chore: fix nolint simpNF exception #761

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chenson2018 merged 1 commit into from
Jul 31, 2026
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chore: fix nolint simpNF exception #761

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10 changes: 5 additions & 5 deletions Cslib/Foundations/Data/OmegaSequence/Flatten.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -123,10 +123,10 @@ theorem append_flatten [Inhabited α] {ls : ωSequence (List α)} (h_ls : ∀ k,
(n : ℕ) : (ls.take n).flatten ++ω (ls.drop n).flatten = ls.flatten := by
induction n generalizing ls <;> grind [tail_eq_drop, take_succ]

/-- The length of `(ls.take n).flatten` is `ls.cumLen n`. -/
@[simp, nolint simpNF, scoped grind =]
theorem length_flatten_take {ls : ωSequence (List α)} (n : ℕ) :
(ls.take n).flatten.length = ls.cumLen n := by
/-- The sum of `List.map List.length (take n ls)` is `ls.cumLen n`. -/
@[simp, scoped grind =]
theorem map_length_take_sum {ls : ωSequence (List α)} (n : ℕ) :
(List.map List.length (take n ls)).sum = ls.cumLen n := by
induction n <;> grind [take_succ']

/-- `In fact, (ls.take n).flatten` is `ls.flatten.take (ls.cumLen n)`
Expand All @@ -137,7 +137,7 @@ theorem flatten_take_drop [Inhabited α]
(ls.drop n).flatten = ls.flatten.drop (ls.cumLen n) := by
apply append_left_right_injective
· rw [append_flatten h_ls n, append_take_drop (ls.cumLen n) ls.flatten]
· rw [length_flatten_take, length_take]
· simp

theorem flatten_take [Inhabited α]
{ls : ωSequence (List α)} (h_ls : ∀ k, (ls k).length > 0) (n : ℕ) :
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