Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
c9239bfaa8
This is "upstreaming" mathlib's `unfold_let` tactic by incorporating its functionality into `unfold`. Now `unfold` can, in addition to unfolding global definitions, unfold local definitions. The PR also updates the `conv` version of the tactic. An improvement over `unfold_let` is that it beta reduces unfolded local functions. Two features not present in `unfold` are that (1) `unfold_let` with no arguments does zeta delta reduction of *all* local definitions, and also (2) `unfold_let` can interleave unfoldings (in contrast, `unfold a b c` is exactly the same as `unfold a; unfold b; unfold c`). Closes RFC #4090 |
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