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    set_value (hash_key: string, key_value: string) : nil
    get_value (hash_key: string) : string

$code = <<DONE;
sub func {
...

eval $code;
&func;

$file = '/some/file/path';
open (CODE, $file) or die qq(can't read "$file": $!);
...
eval $code;

##  and then run some function defined in that code.