{"ast_node_type":"other","tokens":[{"end":97,"kind":"keyword","start":0,"text":"//"}]}
        // which is why we only warn about really_tagged_union reprs from https://rust.tf/rfc2195
    if non_exhaustive_variant_list {
        // with an enum like `#[repr(u8)] enum Enum { A(DataA), B(DataB), }`