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refactor: use the full features of mkAppM in free_union #436

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refactor: use the full features of mkAppM in free_union #436

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9 changes: 5 additions & 4 deletions Cslib/Foundations/Data/HasFresh.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -108,11 +108,12 @@ def HasFresh.freeUnion : TermElab := fun stx _ => do

for ldecl in ← getLCtx do
if !ldecl.isImplementationDetail then
let local_type ← ldecl.toExpr |> inferType >=> whnf
for map in maps do
if let Expr.forallE _ dom _ _ := ← inferType map then
if ← isDefEq local_type dom then
finsets := finsets.push (map.betaRev #[ldecl.toExpr])
let finset ← try
mkAppM' map #[ldecl.toExpr]
catch _ =>
continue
finsets := finsets.push finset.headBeta

let _dec : Q(DecidableEq $α) ← synthInstanceQ q(DecidableEq $α)
let union := finsets.foldl (fun a b : Q(Finset $α) => q($a ∪ $b)) q(∅)
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