It is used outside the subroutine, your question is actually: why is 1; used at the end of a module?

A use statement (as in use module;) evals the contents of a file. The last expression in the file must evaluate to true, or the eval dies.

UPDATE: Correction of my statement by ikegami (see below);
Confucius says kill mosquito unless cannon

In reply to Re: End of subroutine by marcussen
in thread End of subroutine by sandy_1028

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