{"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"X86(X86InlineAsmRegClass::reg)"}]}
            X86(X86InlineAsmRegClass::reg) => "r",
            RiscV(RiscVInlineAsmRegClass::vreg) => unreachable!("clobber-only"),
            X86(X86InlineAsmRegClass::reg_abcd) => "Q",