syntax_data: {"ast_node_type":"other","tokens":[{"end":25,"kind":"keyword","start":0,"text":"None,"}]}
source_snippet:                     None,
context_before:                 (args[0], PlaceElem::Downcast(
context_after:                     VariantIdx::from_u32(self.parse_integer_literal(args[1])? as u32)