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chore: add failing grind test (#9607)

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This PR adds a failing grind test.
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Kim Morrison 2025-07-29 11:36:53 +10:00 • committed by GitHub
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tests/lean/grind/algebra/linarith_cc.lean Normal file
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-- This fails unless we manually substitute `hb`.
-- `grind` doesn't recognise this as a linear arithmetic problem.
example (a : Nat) (ha : a < 8) (b : Nat) (hb : b = 2) : a * b < 8 * b := by
grind -- fails