This tests for a specific interpreter regression where in very specific circumstances involving remapped functions, `_setup.sequence_number` is reset, which triggers the "duplicate O-word label" sanity check. This test triggers the regression by calling a remap twice. In the first call, before the problem O-word, it calls a second-level remap that returns with a reset `_setup.sequence_number`, so the following O-word is recorded with an incorrect position. In the second call, the second-level remap is not invoked, so the following O-word appears at the correct `_setup.sequence_number`; the differing positions then triggers the "duplicate O-word label" sanity check and the program exits with an error.