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sub function

Declare a subroutine, possibly anonymously

    sub BLOCK
    sub NAME
    sub NAME BLOCK

This is subroutine definition, not a real function per se. With just a NAME (and possibly prototypes), it's just a forward declaration. Without a NAME, it's an anonymous function declaration, and does actually return a value: the CODE ref of the closure you just created. See the perlsub manpage and the perlref manpage for details.

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