Thread::Backtrace::Location#syntax_tree

# File tmp/rubies/ruby-4.1.0-preview1/ast.rb, line 471
def syntax_tree
  iseq = Primitive.iseq_of_backtrace_location(self)
  return nil unless iseq

  node_id = Primitive.node_id_for_backtrace_location(self)
  return nil unless node_id

  scope = iseq.syntax_tree
  return nil unless scope

  if scope.is_a?(RubyVM::AbstractSyntaxTree::Node)
    return Primitive.ast_node_find(scope, node_id)
  end

  return scope if scope.node_id == node_id

  queue = [scope]
  while (node = queue.shift)
    node.compact_child_nodes.each do |child|
      return child if child.node_id == node_id
      queue << child
    end
  end

  nil
end