d4b17b9fd2
This PR implements counterexamples for grind linarith. Example:
```lean
example [CommRing α] [LinearOrder α] [Ring.IsOrdered α] (a b c d : α)
: b ≥ 0 → c > b → d > b → a ≠ b + c → a > b + c → a < b + d → False := by
grind
```
produces the counterexample
```
a := 7/2
b := 1
c := 2
d := 3
```
```lean
example [IntModule α] [LinearOrder α] [IntModule.IsOrdered α] (a b c d : α)
: a ≤ b → a - c ≥ 0 + d → d ≤ 0 → b = c → a ≠ b → False := by
grind
```
generates the counterexample
```
a := 0
b := 1
c := 1
d := -1
```
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| .. | ||
| bench | ||
| compiler | ||
| elabissues | ||
| ir | ||
| lean | ||
| pkg | ||
| playground | ||
| plugin | ||
| simpperf | ||
| .gitignore | ||
| common.sh | ||
| lean-toolchain | ||