syntax_data: {"ast_node_type":"variable","tokens":[{"end":70,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let trait_item = self.tcx.require_lang_item(trait_item, span);
context_before:         let re_erased = self.tcx.lifetimes.re_erased;
context_after:         let method = trait_method(self.tcx, trait_item, method, [ty]);