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DB<1> my $x = 1 ... DB<4> p $x 1
DB<5> p $main::x 1
DB<1> 'a' =~ /(.)/ ... DB<3> 'a' =~ /(.)/ && print $1 a DB<4>
DB<5> 'a' =~ /(.)/ && $g = $1 DB<6> print $g a DB<7>