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This question already has an answer here:

In this thread, it is accepted that answers that use a new version of a language created after the challenge was posted are non-competing, because otherwise people would implement new built-ins that fit the challenge.

However, it is not clear in this answer (and @lirtosiast comment is not answered) whether or not a bug fix of the implementation of a language is considered a "new version" or not.

It is pretty common for me to find bugs in my own language while trying to answer a challenge.

Assuming good faith of the user (i.e. that he really intented his language to work that way in the first place), is it acceptable to fix bugs in a language's implementation after the challenge was posted, while keeping the "competing" status of the answer?

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marked as duplicate by Doorknob Jun 7 '16 at 12:01

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    \$\begingroup\$ For the purposes of PPCG languages are their implementations. If no bug-free interpreter exists, no version of the language without the bug exists as far as we're concerned. I think we'd open up a horrible can of worms if we allowed language semantics to be defined by (potentially ambiguous and misimplemented) language specifications. \$\endgroup\$ – Martin Ender Jun 7 '16 at 12:00

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