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Code Golf

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    \$\begingroup\$ Nice, but the explanation is not entirely correct. The compiler knows the arity by the number of arguments of Start; there is no way to write a function in ABC that takes a number of arguments other than the number of arguments of the Clean function. On startup, a Start node is created. When it is evaluated, it is overwritten by _cycle_in_spine. The ABC code is supposed to push a new node on the stack, with which the _cycle_in_spine is then filled. But because it doesn't, the fill_a instruction then attempts to fill an uninitialised node above _cycle_in_spine. \$\endgroup\$ Commented Jan 8, 2019 at 10:51
  • \$\begingroup\$ @Keelan I learn something new every time you comment :). I'll edit that in once I'm back at my computer. \$\endgroup\$ Commented Jan 8, 2019 at 16:03