{"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"builder.map_node(expr.syntax().clone(),"}]}
            builder.map_node(expr.syntax().clone(), ast.expr().unwrap().syntax().clone());
            builder.map_node(pattern.syntax().clone(), ast.pat().unwrap().syntax().clone());
            builder.finish(&mut mapping);