11f618ac49
This PR adds superposition for associative (but non-commutative)
operators in `grind ac`. Examples:
```lean
example {α} (op : α → α → α) [Std.Associative op] (a b c d : α)
: op a b = c →
op b a = d →
op (op c a) (op b c) = op (op a d) (op d b) := by
grind
example {α} (a b c d : List α)
: a ++ b = c →
b ++ a = d →
c ++ a ++ b ++ c = a ++ d ++ d ++ b := by
grind only
```
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| .. | ||
| bench | ||
| compiler | ||
| elabissues | ||
| ir | ||
| lean | ||
| pkg | ||
| playground | ||
| plugin | ||
| simpperf | ||
| .gitignore | ||
| common.sh | ||
| lakefile.toml | ||
| lean-toolchain | ||