Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
02b206af9b
This PR ensures that `mkAppM` can be used to construct terms that are only type-correct at at default transparency, even if we are in `withReducible` (e.g. in simp), so that simp does not stumble over simplifying `let` expression with simplifiable type.reliable. Here is a reproducer of the issue this solves: ``` example (a b : Nat) (h : a = b): (let _ : id Bool := true; a) = (let _ : Bool := true; b) := by simp -zeta -zetaDelta [h] ``` This fixes #7826. |
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