syntax_data: {"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"(\"xop\","}]}
source_snippet:     ("xop", Unstable(sym::xop_target_feature), &[/*"fma4", */ "avx", "sse4a"]),
context_before:     ("x87", Unstable(sym::x87_target_feature), &[]),
context_after:     ("xsave", Stable, &[]),