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class Acceptor
attr_reader :things
def initialize
@things = {}
yield self
end
def method_missing(s, a)
@things[s] = a
end
end
 
def macro(name, &block)
params = Acceptor.new(&block).things
eval <<-EOC
class #{name} < SyntaxNode
def initialize
#{params.map { |k,v| "@#{k} = @elements[#{v}]" }.join("\n")}
end
end
EOC
end
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