Consume whitespace and newlines between the two ] of a potential ]] token

[DavisVaughan]

1[[1[1
]]
]

This is valid R code. The last two ] you see that are spread across multiple lines actually go together as a single ]] token.

Currently we don't consume the whitespace/newlines here so we consume them as unmatched ]s

(program [0, 0] - [2, 1]
  ([[ [0, 0] - [2, 1]
    (float [0, 0] - [0, 1])
    arguments: (arguments [0, 1] - [2, 1]
      argument: (argument [0, 3] - [1, 1]
        value: ([ [0, 3] - [1, 1]
          (float [0, 3] - [0, 4])
          arguments: (arguments [0, 4] - [1, 1]
            argument: (argument [0, 5] - [0, 6]
              value: (float [0, 5] - [0, 6])))))
      argument: (argument [1, 1] - [1, 2]
        value: (] [1, 1] - [1, 2]))
      argument: (argument [2, 0] - [2, 1]
        value: (] [2, 0] - [2, 1])))))