{"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"start_span:"}]}
                        start_span: expr.span.shrink_to_lo().until(arg_span),
                    UseLetUnderscoreIgnoreSuggestion::Suggestion {
                        end_span: arg_span.shrink_to_hi().until(expr.span.shrink_to_hi()),