The construct is interpreted as a label, as the following code shows: 

sub fn { 
    return: 3;
    print 'code after return?'
};

fn()

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As the return value of a function is the last expression evaluated, the value of your constant block, 3, is returned.

In reply to Re: 'return:' instead of 'return' by Corion
in thread 'return:' instead of 'return' by Boldra

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