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  1. or download this
    sub op { @^lhs Z+ @^rhs };

say (1,2) [&op] (3,4); # (4 6)
  2. or download this
    my &infix:<op> = { @^lhs Z+ @^rhs };

say (1,2) op (3,4); # (4 6)
  3. or download this
    my &infix:<op> = &[Z+];

say (1,2) op (3,4); # (4 6)