6 lines
343 B
Text
6 lines
343 B
Text
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-- Prior to leanprover/lean4#2552 there was a performance trap
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-- depending on the implementation details in `decidableBallLT`.
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-- We keep this example (which would have gone over maxHeartbeats)
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-- as a regression test for the instance.
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example : ∀ m, m < 25 → ∀ n, n < 25 → ∀ c, c < 25 → m ^ 2 + n ^ 2 + c ^ 2 ≠ 7 := by decide
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