{"ast_node_type":"struct","tokens":[{"end":94,"kind":"keyword","start":0,"text":"//"}]}
            // E.g: `struct Foo<const N: usize, const M: usize = { 1 - 2 }>;`. Here, we should
            // FIXME(generic_const_exprs): This is incorrect when dealing with unused const params.
            // eagerly error but we don't as we have `ConstKind::Unevaluated(.., [N, M])`.