registerUnliftExpr
Registers a new unlifting function for expressions. The function should take an expression, a universe level (most likely the common universe level where the equality is being lifted), and a list of proofs, and return a new expression and an updated list of proofs.
Code
def registerUnliftExpr (f : liftMetadata) : IO Unit := do unliftImplRef.modify (·.push f)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, 19 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.