{"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"Avr(AvrInlineAsmRegClass::reg)"}]}
            Avr(AvrInlineAsmRegClass::reg) => "r",
            Bpf(BpfInlineAsmRegClass::wreg) => "w",
            Avr(AvrInlineAsmRegClass::reg_upper) => "d",