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fix: ignore unused alternatives in Ord derive handler #3725

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merged 1 commit into from
Mar 21, 2024
Merged

fix: ignore unused alternatives in Ord derive handler #3725

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1 change: 1 addition & 0 deletions src/Lean/Elab/Deriving/Ord.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,7 @@ def mkMutualBlock (ctx : Context) : TermElabM Syntax := do
for i in [:ctx.typeInfos.size] do
auxDefs := auxDefs.push (← mkAuxFunction ctx i)
`(mutual
set_option match.ignoreUnusedAlts true
$auxDefs:command*
end)

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13 changes: 13 additions & 0 deletions tests/lean/run/3706.lean
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@@ -0,0 +1,13 @@
/--Ensure that `deriving Ord` works on indexed inductive types.-/
inductive Ty where
| int
| bool
inductive Expr : Ty → Type where
| a : Expr .int
| b : Expr .bool
deriving Ord

inductive Vec (α : Type u) : Nat → Type u
| nil : Vec α 0
| cons : α → {n : Nat} → Vec α n → Vec α (n+1)
deriving Ord
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