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#!/usr/bin/perl
$var = "World";
${$var} = "hello"; 
print "Variable : $var \n";
print "Interpolated var : ${$var} \n";

#!/usr/bin/perl
use strict;
...
my ${$var} = "hello";     #gives syntax error
print "Variable : $var \n";
print "Interpolated var : ${$var} \n";