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Ask questionscheck_if_rest_of_carry4_is_unused: assert cell_idx < len(O_ports) - 1

I encountered this using the symbiflow-examples installation and attempting to use it to build a LiteX SoC.

I added some debugging in the script; there were 4 O_ports, and cell_idx was 3.

I'll attach the testcase as a tarfile here.

SymbiFlow/symbiflow-examples

Answer questions tcal-x

16. Executing JSON backend.
ERROR: TCL interpreter returned an error: Traceback (most recent call last):
  File "/media/tim/GIT/opt/symbiflow/xc7/install/share/symbiflow/scripts/fix_xc7_carry.py", line 605, in <module>
    main()
  File "/media/tim/GIT/opt/symbiflow/xc7/install/share/symbiflow/scripts/fix_xc7_carry.py", line 598, in main
    design, top_module, bit_to_cells, bit_to_nets, chain
  File "/media/tim/GIT/opt/symbiflow/xc7/install/share/symbiflow/scripts/fix_xc7_carry.py", line 559, in fixup_congested_rows
    check_if_rest_of_carry4_is_unused(cellname, cell_idx + 1):
  File "/media/tim/GIT/opt/symbiflow/xc7/install/share/symbiflow/scripts/fix_xc7_carry.py", line 508, in check_if_rest_of_carry4_is_unused
    assert cell_idx < len(O_ports) - 1
AssertionError
useful!

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