syntax_data: {"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                     let clone_trait = this.tcx.require_lang_item(LangItem::Clone, span);
context_before:                     let success = this.cfg.start_new_block();
context_after:                     let clone_fn = this.tcx.associated_item_def_ids(clone_trait)[0];