{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"ExprKind::Field(base,"}]}
                ExprKind::Field(base, ident) => (base.span, ident.span),
            let (lhs_span, rhs_span) = match &expr.kind {
                ExprKind::MethodCall(box MethodCall { receiver, span, .. }) => {