syntax_data: {"ast_node_type":"other","tokens":[{"end":78,"kind":"keyword","start":0,"text":"base.features"}]}
source_snippet:     base.features = "+cx16,+sahf,+popcnt,+sse3,+sse4.1,+sse4.2,+ssse3".into();
context_before:     // which corresponds to x86-64-v2.
context_after:     base.max_atomic_width = Some(128);