syntax_data: {"ast_node_type":"other","tokens":[{"end":33,"kind":"keyword","start":0,"text":"(\"avx\","}]}
source_snippet:     ("avx", Stable, &["sse4.2"]),
context_before:     ("apxf", Unstable(sym::apx_target_feature), &[]),
context_after:     ("avx2", Stable, &["avx"]),