{"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":".and_then(|node|"}]}
                    .and_then(|node| node.fn_decl())
                tcx.hir_get_if_local(impl_m.def_id)
                    .map(|decl| (decl.output.span(), Cow::from("return type in trait"), false)),