Sequential scan pattern is broken

This code:

import loopy as lp

knl = lp.make_kernel(
    ["[n] -> { [i] : 0 <= i < n }",
     "{ [i_tracker] : i >= 0 and i_tracker >= -1 + 2i and 0 <= i_tracker <= 2i }"],
    """
    <>acc_j = 0
    for i
     for i_tracker
      acc_j = acc_j + i_tracker**2
     end
     <>a[i] = acc_j
    end
    """,
    "..."
    )

lp.generate_code_v2(knl)

results in:

RuntimeError: non-unique var name 'i' encountered

I think this was caused by !84 (merged)