{"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"AArch64(AArch64InlineAsmRegClass::preg)"}]}
            AArch64(AArch64InlineAsmRegClass::preg) => unreachable!("clobber-only"),
            AArch64(AArch64InlineAsmRegClass::vreg_low16) => "x",
            Arm(ArmInlineAsmRegClass::reg) => "r",