get_config(split(/$s/), $_);
get_config(split(/$s/, $_));

##</code><code>##

  DB<101> unless defined($a) { print "OK" }
syntax error at (eval 7)[/usr/share/perl5/5.26/perl5db.pl:738] line 2, near "unless defined"

  DB<102> unless( defined($a) ){ print "OK" }
OK
  DB<103> print 'OK' unless defined($a);
OK