{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"///"}]}
    /// for constants other than `ty::ConstKind::Infer(_)` (or `InferConst::Fresh`).
    /// for types other than `ty::Infer(_)` (or `InferTy::Fresh*`) and
    pub fn maybe_from_generic_arg(arg: GenericArg<'tcx>) -> Option<Self> {