{"ast_node_type":"other","tokens":[{"end":116,"kind":"keyword","start":0,"text":"//"}]}
                            // FIXME: This isn't really correct wrt. escaping, but that's what rustc does and anyway
                        ConcatMetaVarExprElem::Literal(lit) => {
                            // escaping is used most of the times for characters that are invalid in identifiers.