`transformExpr`🔗

Definition

Transforms an expression using the registered lifting/unlifting functions given in impl_ref. Returns the first successful transformation along with the updated list of proofs.

def

transformExpr (e : Lean.Expr) (maxLvl : Lean.Level)
  (proofs : List Lean.Expr) (impl_ref : IO.Ref (Array liftMetadata)) :
  Lean.MetaM (Lean.Expr × List Lean.Expr)
transformExpr (e : Lean.Expr)
  (maxLvl : Lean.Level)
  (proofs : List Lean.Expr)
  (impl_ref :
    IO.Ref (Array liftMetadata)) :
  Lean.MetaM (Lean.Expr × List Lean.Expr)

Code

def transformExpr (e : Expr) (maxLvl : Level) (proofs : List Expr)
    (impl_ref : IO.Ref (Array (liftMetadata))) : MetaM (Expr × List Expr) := do
  let handlers ← impl_ref.get
  let (lift_expr, proofs) ← handlers.firstM (fun h => h e maxLvl proofs) <|> do
    throwError "No transform handler found for {e}."
  return (lift_expr, proofs)

Actions: Source · Open Issue

Meaning last changed in v4.34.0-rc2-1-g439785b (2026-08-23).

Self-contained, with its dependencies inlined and proofs replaced by sorry: download the raw file · open it in the Lean web editor.

Dependency graph

Audit surface: 1 project declarations, 61 external constants

✓ Proved: no sorry anywhere in its closure

This is the tool's own reading of one build's recorded axioms, and it is not robust against an author who wants it to pass. Checking meant to be relied on should go through Comparator, which replays the proof through the kernel from an export against an explicit list of permitted axioms.

transformExpr🔗

`transformExpr`🔗