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  1. or download this
    $t = 1;
${ "type" . $t } = "Hello world!\n";
...
__OUTPUT__
Hello world!
Hello world!
  2. or download this
    $t = 1;

...
__OUTPUT__
Hello world!
Hello world!
  3. or download this
    my $t = 1;

...
print ${$main::{hash}}{type1};
__OUTPUT__
Hello world!