[Merged by Bors] - feat: finset distributivity lemmas
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Match leanprover-community/mathlib#18611 [`data.finset.lattice`@`9d684a893c52e1d6692a504a118bfccbae04feeb`..`2d44d6823a96f9c79b7d1ab185918377be663424`](https://leanprover-community.github.io/mathlib-port-status/file/data/finset/lattice?range=9d684a893c52e1d6692a504a118bfccbae04feeb..2d44d6823a96f9c79b7d1ab185918377be663424)
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eric-wieser
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eric-wieser
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| -- porting note: `simpa` doesn't support placeholders in proof terms | ||
| have := h (fun j hj => if hji : j = i then cast (congr_arg κ hji.symm) a | ||
| else g _ <| mem_of_mem_insert_of_ne hj hji) (fun j hj => ?_) |
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So ?_ doesn't work in a simpa using?
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Match leanprover-community/mathlib#18611 [`data.finset.lattice`@`9d684a893c52e1d6692a504a118bfccbae04feeb`..`2d44d6823a96f9c79b7d1ab185918377be663424`](https://leanprover-community.github.io/mathlib-port-status/file/data/finset/lattice?range=9d684a893c52e1d6692a504a118bfccbae04feeb..2d44d6823a96f9c79b7d1ab185918377be663424)
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Match leanprover-community/mathlib#18611
data.finset.lattice@9d684a893c52e1d6692a504a118bfccbae04feeb..2d44d6823a96f9c79b7d1ab185918377be663424