{"ast_node_type":"other","tokens":[{"end":24,"kind":"keyword","start":0,"text":"Base(FruInfo<'tcx>),"}]}
    Base(FruInfo<'tcx>),
    /// will be used to populate any fields not explicitly mentioned: `Foo { ..base }`
    /// A struct expression with a `..` tail but no "base" expression. The values from the struct