{"ast_node_type":"other","tokens":[{"end":71,"kind":"keyword","start":0,"text":"InlineAsmRegClass::Msp430(Msp430InlineAsmRegClass::reg)"}]}
        InlineAsmRegClass::Msp430(Msp430InlineAsmRegClass::reg) => "r",
        InlineAsmRegClass::Mips(MipsInlineAsmRegClass::freg) => "f",
        // https://github.com/gcc-mirror/gcc/blob/master/gcc/config/nvptx/nvptx.md -> look for