{"ast_node_type":"other","tokens":[{"end":20,"kind":"keyword","start":0,"text":"#[subdiagnostic]"}]}
    #[subdiagnostic]
    pub sub: Option<OverflowingBinHexSub<'a>>,
    pub sign_bit_sub: Option<OverflowingBinHexSignBitSub<'a>>,