syntax_data: {"ast_node_type":"function","tokens":[{"end":41,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn contains(&self, elem: T) -> bool {
context_before: impl<T, S: BitSetExt<T>> BitSetExt<T> for MaybeReachable<S> {
context_after:         self.contains(elem)