syntax_data: {"ast_node_type":"other","tokens":[{"end":24,"kind":"keyword","start":0,"text":"Some(0)"}]}
source_snippet:             Some(0) => {
context_before:         let ret = match v.and_then(|s| s.parse().ok()) {
context_after:                 *slot = std::thread::available_parallelism().map_or(1, NonZero::<usize>::get);