Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
4d2576362b
This PR ensures that the auxiliary temporary metavariable IDs created by the E-matching module used in `grind` are not affected by what has been executed before invoking `grind`. The goal is to increase `grind`’s robustness. For example, in the E-matching module we use `Expr.quickLt` to sort candidates. `Expr.quickLt` depends on the `Expr` hash code, which in turn depends on metavariable IDs. Thus, before this change, the initial next metavariable ID at the time of `grind` invocation could affect the order in which instances were generated, and consequently the `grind` search. |
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