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The first test case added in the LIT test demonstrates the problem. Even though we did not consider the inner loop as a candidate for the transformation due to the array_coor with a slice, we decided to version the outer loop for the same function argument. During the cloning of the outer loop we dropped the slicing completely producing invalid code. I restructured the code so that we record all arg uses that cannot be transformed (regardless of the reason), and then fixup the usage information across the loop nests. I also noticed that we may generate redundant contiguity checks for the inner loops, so I fixed it since it was easy with the new way of keeping the usage data.