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sub x1 { @_ = 'a'; &x2 }
sub x2 { my ($c) = @_; say $c, (caller 0)[4] }
x2('b');  # b1
x1();     # a

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($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,