Lean 4 fork for HoTT-compatible kernel extensions (Path types, transport, HITs). Maintained against upstream leanprover/lean4.
efb398b040
This PR implements the new E-matching pattern inference heuristic for `grind`. It is not enabled yet. You can activate the new behavior using `set_option backward.grind.inferPattern false`. Here is a summary of the new behavior. * `[grind =]`, `[grind =_]`, `[grind _=_]`, `[grind <-=]`: no changes; we keep the current behavior. * `[grind ->]`, `[grind <-]`, `[grind =>]`, `[grind <=]`: we stop using the *minimal indexable subexpression* and instead use the first indexable one. * `[grind! <mod>]`: behaves like `[grind <mod>]` but uses the minimal indexable subexpression restriction. We generate an error if the user writes `[grind! =]`, `[grind! =_]`, `[grind! _=_]`, or `[grind! <-=]`, since there is no pattern search in these cases. * `[grind]`: it tries `=`, `=_`, `<-`, `->`, `<=`, `=>` with and without the minimal indexable subexpression restriction. For the ones that work, we generate a code action to encourage users to select the one they prefer. * `[grind!]`: it tries `<-`, `->`, `<=`, `=>` using the minimal indexable subexpression restriction. For the ones that work, we generate a code action to encourage users to select the one they prefer. * `[grind? <mod>]`: where `<mod>` is one of the modifiers above, it behaves like `[grind <mod>]` but also displays the pattern. Example: ```lean /-- info: Try these: • [grind =] for pattern: [f (g #0)] • [grind =_] for pattern: [r #0 #0] • [grind! ←] for pattern: [g #0] -/ #guard_msgs in @[grind] axiom fg₇ : f (g x) = r x x ``` |
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