{"ast_node_type":"other","tokens":[{"end":44,"kind":"keyword","start":0,"text":"|"}]}
| BPF          | `r[0-10]`     | `w[0-10]` |
| PowerPC      | `f[0-31]`     | `fr[0-31]`|
| AVR          | `XH`          | `r27`     |