syntax_data: {"ast_node_type":"other","tokens":[{"end":31,"kind":"keyword","start":0,"text":"(\"rdm\","}]}
source_snippet:     ("rdm", Stable, &["neon"]),
context_before:     // FEAT_RDM
context_after:     ("reserve-x18", Forbidden { reason: "use `-Zfixed-x18` compiler flag instead" }, &[]),