{"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":".map_or(default,"}]}
            .map_or(default, |i| BoundVar::new(binder, i).to_lifetime(Interner).cast(Interner)),
        chalk_ir::VariableKind::Lifetime => find_var(iv)
        chalk_ir::VariableKind::Const(ty) => find_var(iv)