Didn't you mean 
last unless $@;

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? Your code tries to use both the modules regardless of their availability. 

($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 reply to Re^2: preferred loading of XS modules by choroba
in thread preferred loading of XS modules by jason0

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