{"ast_node_type":"struct","tokens":[{"end":78,"kind":"keyword","start":0,"text":"///"}]}
    /// E.g., given `struct Ty<const N: usize = 3>;` this returns `3` for `N`.
    ///
    query const_param_default(param: DefId) -> ty::EarlyBinder<'tcx, ty::Const<'tcx>> {