class Prism::Dispatcher

def visit_symbol_node(node)

walking the tree.
Dispatch enter and leave events for SymbolNode nodes and continue 
def visit_symbol_node(node)
  listeners[:on_symbol_node_enter]&.each { |listener| listener.on_symbol_node_enter(node) }
  super
  listeners[:on_symbol_node_leave]&.each { |listener| listener.on_symbol_node_leave(node) }
end