c06af84d9f
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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|---|---|---|
| .. | ||
| module_normalization.lean | ||
| nat_mod.lean | ||
| nat_module.lean | ||
| nlinarith.lean | ||
| ring_normalization.lean | ||