{"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"X86(X86InlineAsmRegClass::reg)"}]}
        X86(X86InlineAsmRegClass::reg) | X86(X86InlineAsmRegClass::reg_abcd) => match modifier {
        RiscV(RiscVInlineAsmRegClass::vreg) => unreachable!("clobber-only"),
            None if arch == InlineAsmArch::X86_64 => Some('q'),