def _create_fatal_error_node(self, start_pos):
"""
Creates a non-existing node in the data tree
to wrap the content of the error (span) in a node.
"""
node = ScalarDataNode()
end_pos = Position.from_document_end(self._document)
node.span = Span(start_pos, end_pos)
node.key = TextValue('fatal_error')
node.origin = DataNode.Origin.error
node.hidden = True
self._fatal_error_node = node
