in a BEGIN block. That's important, because it can change how the rest of the code is parsed. For OO modules, that's usually not an issue, but if the module introduces keywords with fancy syntax (like capture { ... }), you need to predeclare these with the appropriate prototypes, otherwise the parser can't parse them; or you need to call them without the special syntax (capture(sub { ... });). Read perlsub to learn about compile time and prototypes.

($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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