syntax_data: {"ast_node_type":"other","tokens":[{"end":34,"kind":"keyword","start":0,"text":"v.sort_unstable();"}]}
source_snippet:                 v.sort_unstable();
context_before:                 let mut v: Vec<_> = s.split(',').map(|s| s.to_string()).collect();
context_after:                 *slot = Some(v);