in reply to Re^2: Merge log files causing Out of Memory (just a note on ampersand)
in thread Merge log files causing Out of Memory

There's one more context where & isn't optional: 
goto &func;

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See goto.

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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In Section Seekers of Perl Wisdom