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fix: expose Vector DecidableEq for kernel reduction #14988

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fix: expose Vector DecidableEq for kernel reduction #14988

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2 changes: 1 addition & 1 deletion src/Init/Data/Vector/Basic.lean
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Expand Up @@ -36,7 +36,7 @@ structure Vector (α : Type u) (n : Nat) where
toArray : Array α
/-- Array size. -/
size_toArray : toArray.size = n
deriving DecidableEq
deriving @[expose] DecidableEq

attribute [simp, grind =] Vector.size_toArray

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9 changes: 9 additions & 0 deletions tests/elab/vector_decidable_eq_module.lean
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@@ -0,0 +1,9 @@
module

/-!
Tests kernel reduction of derived `Vector` equality across a module boundary.
-/

example : (#v[] : Vector Nat 0) = #v[] := by decide
example : decide ((#v[] : Vector Nat 0) = #v[]) = true := by rfl
example : (#v[] : Vector Nat 0) = #v[] := by decide +kernel
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