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  1. or download this
      my $gnuplot = eval \$buffer->($canvas); 
 #OUTPUT:
 #Undefined subroutine &main::sub {
  2. or download this
     my $gnuplot = eval \$buffer;  
 $gnuplot->($canvas); 
...
# OUTPUT
# Use of uninitialized value in subroutine entry at ....
# Undefined subroutine &main:: called at ./zz-std.....