This PR makes `#guard_msgs` to treat `trace` messages separate from
`info`, `warning` and `error`. It also introduce the ability to say
`#guard_msgs (pass info`, like `(drop info)` so far, and also adds
`(check info)` as the explicit form of `(info)`, for completeness.
Fixes#8266
This PR adds the attribute `[grind ext]`. It is used to select which
`[ext]` theorems should be used by `grind`. The option `grind +extAll`
instructs `grind` to use all `[ext]` theorems available in the
environment.
After update stage0, we need to add the builtin `[grind ext]`
annotations to key theorems such as `funext`.
This PR cleans up the `Option` development, upstreaming some results
from mathlib in the process.
Notable changes:
- the name `<op>_eq_some_iff` is preferred over `<op>_eq_some`
- the `simp` normal form for `<$>` is `Option.map`, for `>>=` is
`Option.bind` and for `<|>` is `Option.orElse` (for the former two, this
was already true before this PR). All further lemmas about these
operations are now stated only in terms of
`Option.map`/`Option.bind`/`Option.orElse`. Previously, in some cases
both versions were available, with a prime used to disambiguate (the
primed version was usually the "non-ascii-art" version). Now, there are
no lemmas about the ascii-art versions besides the ones turning them
into the non-ascii-art operations, and there is only one version of
every lemma, about the non-ascii-art operation, and named without a
prime.
This PR adds the new attributes `[grind =>]` and `[grind <=]` for
controlling pattern selection and minimizing the number of places where
we have to use verbose `grind_pattern` command. It also fixes a bug in
the new pattern selection procedure, and improves the automatic pattern
selection for local lemmas.
The tests `grind_constProp.lean` and `no_grind_constProp.lean` are the
same use case with and without `grind`.
This PR adds a few builtin case-splits for `grind`. They are similar to
builtin `simp` theorems. They reduce the noise in the tactics produced
by `grind?`.
