syntax_data: {"ast_node_type":"variable","tokens":[{"end":36,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let parent = self.parent()?;
context_before:     fn parent_impl_trait_ref(&self) -> Option<ty::TraitRef<'tcx>> {
context_after:         if matches!(self.tcx.def_kind(parent), DefKind::Impl { .. }) {