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  • \$\begingroup\$ For a no-op, you can just use 1 or something. It will work on TIO. Also, : is treated as whitespace, so it doesn't take up the whole while block. \$\endgroup\$ Commented Aug 3, 2022 at 21:03
  • \$\begingroup\$ @Steffan I can't use a number in this case because it would get parsed with the 2. Is : actually completely equivalent to whitespace? \$\endgroup\$ Commented Aug 3, 2022 at 21:05
  • \$\begingroup\$ Yes, : is equivalent to whitespace. It's documented in the spec. You can also use one of NTF, but it will be grouped with O \$\endgroup\$ Commented Aug 3, 2022 at 21:06
  • \$\begingroup\$ The spec says that it "can (usually) be considered whitespace", not that it's always the same as whitespace. \$\endgroup\$ Commented Aug 3, 2022 at 21:12
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    \$\begingroup\$ Actually, you're right. But this code is still invalid. : takes an argument, and it will consume O/x 4 for that argument. And it is implemented in TIO. In this code, it is equivalent to whitespace. It is only not equivalent at the end of a program. \$\endgroup\$ Commented Aug 3, 2022 at 21:14