This PR fixes a bug in the `grind` term preprocessor. It was abstracting
nested proofs **before** reducible constants were unfolded.
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Co-authored-by: Kim Morrison <kim@tqft.net>
This PR adds additional tests for `grind`, demonstrating that we can
automate some manual proofs from Mathlib's basic category theory
library, with less reliance on Mathlib's `@[reassoc]` trick.
In several places I've added bidirectional patterns for equational
lemmas.
I've updated some other files to use the new `@[grind_eq]` attribute
(but left as is all cases where we are inspecting the info messages from
`grind_pattern`).
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Co-authored-by: Leonardo de Moura <leomoura@amazon.com>
