syntax_data: {"ast_node_type":"function","tokens":[{"end":83,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:             fn enqueue(&mut self, a_state: Option<State>, b_state: Option<State>) {
context_before:         impl WorkQueue {
context_after:                 if self.enqueued.insert((a_state, b_state)) {