{"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"///"}]}
    /// A union definition, e.g., `union Foo<A, B> {x: A, y: B}`.
    Struct(Ident, &'hir Generics<'hir>, VariantData<'hir>),
    Union(Ident, &'hir Generics<'hir>, VariantData<'hir>),