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Timwi
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Funciton (186 bytes in UTF-16)

╔════════════════════════════╗
║1934282307508088037380718711╟
╚════════════════════════════╝

This program prints “world”.

Any substring you remove from this will stop it from being a complete box, which the parser will complain about — with only one exception: removing the entire middle line, leaving this:

╔════════════════════════════╗
╚════════════════════════════╝

Doing so removes the dangling end on the right (the output). This is no longer a valid program. It is simply an empty comment, but the parser expects a program with exactly one output:

Error: Source files do not contain a program (program must have an output).

Therefore, this program is pristine.

Timwi
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  • 60