syntax_data: {"ast_node_type":"other","tokens":[{"end":26,"kind":"keyword","start":0,"text":"None"}]}
source_snippet:             None => false,
context_before:         let in_trait_mod = match impl_trait_ref {
context_after:             Some(trait_ref) => self.tcx().parent(trait_ref.def_id) == parent_def_id,