class Prism::BlockNode

^^^^^^^^^^^^^^
[1, 2, 3].each { |i| puts x }
Represents a block of ruby code.

def accept(visitor)

def accept: (visitor: Visitor) -> void 
def accept(visitor)
  visitor.visit_block_node(self)
end

def child_nodes

def child_nodes: () -> Array[nil | Node] 
def child_nodes
  [parameters, body]
end

def closing

def closing: () -> String 
def closing
  closing_loc.slice
end

def comment_targets

def comment_targets: () -> Array[Node | Location] 
def comment_targets
  [*parameters, *body, opening_loc, closing_loc]
end

def compact_child_nodes

def compact_child_nodes: () -> Array[Node] 
def compact_child_nodes
  compact = []
  compact << parameters if parameters
  compact << body if body
  compact
end

def copy(**params)

def copy: (**params) -> BlockNode 
def copy(**params)
  BlockNode.new(
    params.fetch(:locals) { locals },
    params.fetch(:parameters) { parameters },
    params.fetch(:body) { body },
    params.fetch(:opening_loc) { opening_loc },
    params.fetch(:closing_loc) { closing_loc },
    params.fetch(:location) { location },
  )
end

def deconstruct_keys(keys)

def deconstruct_keys: (keys: Array[Symbol]) -> Hash[Symbol, nil | Node | Array[Node] | String | Token | Array[Token] | Location] 
def deconstruct_keys(keys)
  { locals: locals, parameters: parameters, body: body, opening_loc: opening_loc, closing_loc: closing_loc, location: location }
end

def initialize(locals, parameters, body, opening_loc, closing_loc, location)

def initialize: (locals: Array[Symbol], parameters: BlockParametersNode?, body: Node?, opening_loc: Location, closing_loc: Location, location: Location) -> void 
def initialize(locals, parameters, body, opening_loc, closing_loc, location)
  @locals = locals
  @parameters = parameters
  @body = body
  @opening_loc = opening_loc
  @closing_loc = closing_loc
  @location = location
end

def inspect(inspector = NodeInspector.new) 

def inspect(inspector = NodeInspector.new)
  inspector << inspector.header(self)
  inspector << "├── locals: #{locals.inspect}\n"
  if (parameters = self.parameters).nil?
    inspector << "├── parameters: ∅\n"
  else
    inspector << "├── parameters:\n"
    inspector << parameters.inspect(inspector.child_inspector("│   ")).delete_prefix(inspector.prefix)
  end
  if (body = self.body).nil?
    inspector << "├── body: ∅\n"
  else
    inspector << "├── body:\n"
    inspector << body.inspect(inspector.child_inspector("│   ")).delete_prefix(inspector.prefix)
  end
  inspector << "├── opening_loc: #{inspector.location(opening_loc)}\n"
  inspector << "└── closing_loc: #{inspector.location(closing_loc)}\n"
  inspector.to_str
end

def opening

def opening: () -> String 
def opening
  opening_loc.slice
end

def type

def type: () -> Symbol

keys will use a jump table.
you can take advantage of the fact that case statements with all symbol
it uses a single integer comparison, but also because if you're on CRuby
can use for comparison. This is faster than the other approaches because
Instead, you can call #type, which will return to you a symbol that you

method calls, and/or array allocations.
these approaches are relatively slow because of the constant lookups,
case statement and doing `case node; when cls1; when cls2; end`. Both of
calling `[cls1, cls2].include?(node.class)` or putting the node into a
classes to see what kind of behavior to perform. Usually this is done by
Sometimes you want to check an instance of a node against a list of 
def type
  :block_node
end