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chore(Combinatorics/Enumerative/Partition): auto-derive DecidableEq #20277

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chore(Combinatorics/Enumerative/Partition): auto-derive DecidableEq #20277

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chore(Combinatorics/Enumerative/Partition): auto-drive DecidableEq
LeoDog896 Dec 28, 2024
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chore(Combinatorics/Enumeration/Partition): add deprecation notice fo…
LeoDog896 Dec 28, 2024
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5 changes: 2 additions & 3 deletions Mathlib/Combinatorics/Enumerative/Partition.lean
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Expand Up @@ -54,12 +54,11 @@ structure Partition (n : ℕ) where
parts_pos : ∀ {i}, i ∈ parts → 0 < i
/-- proof that the `parts` sum to `n`-/
parts_sum : parts.sum = n
-- Porting note: chokes on `parts_pos`
--deriving DecidableEq
deriving DecidableEq

namespace Partition

-- TODO: This should be automatically derived, see https://github.com/leanprover/lean4/issues/2914
@[deprecated "Partition now derives an instance of DecidableEq." (since := "2024-12-28")]
instance decidableEqPartition {n : ℕ} : DecidableEq (Partition n) :=
fun _ _ => decidable_of_iff' _ Partition.ext_iff

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