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  1. or download this
    int func(int &at0, int &at1, int &at2);
    func(i, *(new int(++i)), *(new int(i+2)));
    
  2. or download this
    my $i = 5;
    func($i+0, $i, ++$i, $i+0);  # 5 6 6 6 for me.
    #    ^^^^  ^^
    #  rvalue  lvalue
    
  3. or download this
    my $i = 5;
    func($i,   ++i, $i+2);  # 6 6 8 for me.
    ...
    func($i+0, ++i, $i+2);  # 5 6 8 for me.
         ^^^^
        rvalue