{"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"//"}]}
            // eagerly error but we don't as we have `ConstKind::Unevaluated(.., [N, M])`.
            // E.g: `struct Foo<const N: usize, const M: usize = { 1 - 2 }>;`. Here, we should
            if !default.has_param() {