syntax_data: {"ast_node_type":"function","tokens":[{"end":87,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn apply(state: &mut DenseBitSet<Local>, place: Place<'_>, context: PlaceContext) {
context_before: impl DefUse {
context_after:         match DefUse::for_place(place, context) {