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  1. or download this
    my $foo = $bar;
print "hi $foo\n";
print 'hi ', $foo, "\n";
  2. or download this
    ppi_dumper very-easy-print-interpolation2.pl
  3. or download this
    PPI::Document
  PPI::Statement::Variable
...
    PPI::Token::Whitespace      ' '
    PPI::Token::Quote::Double   '"\n"'
    PPI::Token::Structure       ';'