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-rw-r--r--backends/lean/Base/Arith/Scalar.lean4
1 files changed, 4 insertions, 0 deletions
diff --git a/backends/lean/Base/Arith/Scalar.lean b/backends/lean/Base/Arith/Scalar.lean
index b792ff21..db672489 100644
--- a/backends/lean/Base/Arith/Scalar.lean
+++ b/backends/lean/Base/Arith/Scalar.lean
@@ -46,4 +46,8 @@ example (x y : U32) : x.val ≤ Scalar.max ScalarTy.U32 := by
example (x y : U32) : x.val ≤ Scalar.max ScalarTy.U32 := by
scalar_tac
+-- Checking that we explore the goal *and* projectors correctly
+example (x : U32 × U32) : 0 ≤ x.fst.val := by
+ scalar_tac
+
end Arith