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d03762b | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 | /- Copyright (c) Kyle Miller, 2023. All rights reserved. -/
import Mathlib.Lean.Expr.Basic
open Lean in
/-- Set all the binder infos to `default` in a chain of `Exists`s. -/
partial def fixExists (e : Expr) : MetaM (Bool × Expr) := do
let (`Exists, #[α, .lam x ty body bi]) := e.getAppFnArgs | return (false, e)
let (changed, body) ← fixExists body
let changed := changed || bi != .default
return (changed, mkAppN e.getAppFn #[α, .lam x ty body .default])
open Lean Lean.PrettyPrinter.Delaborator in
@[delab app.Exists]
def withFixedExists : Delab := do
let (changed, e) ← fixExists (← SubExpr.getExpr)
unless changed do failure
withTheReader SubExpr (fun cfg => { cfg with expr := e}) delab
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