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  1. or download this
     
    $ perl -wE 'my $x={};my %h; say "plain $h{new} deref $x->{new}"'
    Use of uninitialized value $h{"new"} in concatenation (.) or string at
    + -e line 1.
    Use of uninitialized value in concatenation (.) or string at -e line 1
    +.
    plain  deref
    
  2. or download this
    $ perlbrew use perl-5.8.9
    $ perl -we 'my $x={};my %h; print "plain $h{new} deref $x->{new}"'
    Use of uninitialized value in concatenation (.) or string at -e line 1
    +.
    Use of uninitialized value in concatenation (.) or string at -e line 1
    +.