This PR resolves a defeq diamond, which caused a problem in Mathlib:
```
import Mathlib
example (R : Type) [I : Ring R] :
@AddCommGroup.toGrindIntModule R (@Ring.toAddCommGroup R I) =
@Lean.Grind.Ring.instIntModule R (@Ring.toGrindRing R I) := rfl -- fails
```
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|---|---|---|
| .. | ||
| algebra | ||
| experiments | ||
| grind_palindrome.lean | ||
| grind_sym_prio.lean | ||
| README.md | ||
| sublist.lean | ||
Aspirational test cases for grind
These are not expected to work yet; we're collecting examples that we'd like to make work!