{"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"None"}]}
            None if arch == InlineAsmArch::X86_64 => Some('q'),
        X86(X86InlineAsmRegClass::reg) | X86(X86InlineAsmRegClass::reg_abcd) => match modifier {
            None => Some('k'),