syntax_data: {"ast_node_type":"other","tokens":[{"end":30,"kind":"keyword","start":0,"text":"(\"kl\","}]}
source_snippet:     ("kl", Stable, &["sse2"]),
context_before:     ("gfni", Stable, &["sse2"]),
context_after:     ("lahfsahf", Unstable(sym::lahfsahf_target_feature), &[]),