{"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"S390x(S390xInlineAsmRegClass::areg)"}]}
            S390x(S390xInlineAsmRegClass::areg) => {
            S390x(S390xInlineAsmRegClass::vreg) => "v",
                unreachable!("clobber-only")