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For your programming language, try to come up with a piece of code, that, no matter what is put around it after the fact, cannot be compiled/interpreted.

For example:

Code...

Your snippet

...More Code

Shouldn't be fixable by doing something like this:

Code...
# Multiline Comment Start
Your snippet
# Multiline Comment End
...More Code

So your snippet's codeblock itself won't be touched, but everything around it can be tweaked to try to ignore it or make it work somehow.

Your task is to come put with the shortest possible block of code(number of characters), that cannot be part of any compilable/interpretable program of your language.

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