Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
675244de76
This PR introduces the `[grind_eq]` attribute, designed to annotate equational theorems and functions for heuristic instantiations in the `grind` tactic. When applied to an equational theorem, the `[grind_eq]` attribute instructs the `grind` tactic to automatically use the annotated theorem to instantiate patterns during proof search. If applied to a function, it marks all equational theorems associated with that function. ```lean @[grind_eq] theorem foo_idempotent : foo (foo x) = foo x := ... @[grind_eq] def f (a : Nat) := match a with | 0 => 10 | x+1 => g (f x) ``` In the example above, the `grind` tactic will add instances of the theorem `foo_idempotent` to the local context whenever it encounters the pattern `foo (foo x)`. Similarly, functions annotated with `[grind_eq]` will propagate this annotation to their associated equational theorems. |
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