`unliftKernel`🔗

Definition

Unlifts a lifted kernel by returning the inner kernel.

def

unliftKernel (e : Lean.Expr) :
  Lean.Level →
    (proofs : List Lean.Expr) → Lean.MetaM (Lean.Expr × List Lean.Expr)
unliftKernel (e : Lean.Expr) :
  Lean.Level →
    (proofs : List Lean.Expr) →
      Lean.MetaM
        (Lean.Expr × List Lean.Expr)

Code

def unliftKernel (e : Expr) (_ : Level) (proofs : List Expr) :
    MetaM (Expr × List Expr) := do
  unless e.isAppOf ``Kernel.lift do
    throwError "Expected a lifted kernel, but got {e}."
  let args := e.getAppArgs
  let κ := args[args.size - 1]!
  return (κ, 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

Nothing to draw. Its statement rests on no other declaration in this project, and names nothing from a package left unaudited — so the graph is this declaration alone. That is the answer, not a missing picture.

Audit surface: 0 project declarations, 65 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.

unliftKernel🔗

`unliftKernel`🔗