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Showing content from https://ruby-syntax-tree.github.io/syntax_tree/SyntaxTree/ExcessedComma.html below:

class SyntaxTree::ExcessedComma - RDoc Documentation

1. SyntaxTree::
2. ExcessedComma

ExcessedComma represents a trailing comma in a list of block parameters. It changes the block parameters such that they will destructure.

[[1, 2, 3], [2, 3, 4]].each do |first, second,|
end

In the above example, an ExcessedComma node would appear in the third position of the Params node that is used to declare that block. The third position typically represents a rest-type parameter, but in this case is used to indicate that a trailing comma was used.

def initialize(value:, location:)
  @value = value
  @location = location
  @comments = []
end

def ===(other)
  other.is_a?(ExcessedComma) && value === other.value
end

def accept(visitor)
  visitor.visit_excessed_comma(self)
end

def copy(value: nil, location: nil)
  node =
    ExcessedComma.new(
      value: value || self.value,
      location: location || self.location
    )

  node.comments.concat(comments.map(&:copy))
  node
end

def deconstruct_keys(_keys)
  { value: value, location: location, comments: comments }
end

def format(q)
  q.text(value)
end

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