syntax_data: {"ast_node_type":"variable","tokens":[{"end":66,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let generics = self.tcx().generics_of(def_id);
context_before:                 if !args.is_empty() {
context_after:                     parent_args = &args[..generics.parent_count.min(args.len())];