syntax_data: {"ast_node_type":"function","tokens":[{"end":83,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet:     pub fn apply(&self, place: PlaceIndex, elem: TrackElem) -> Option<PlaceIndex> {
context_before:     /// Applies a single projection element, yielding the corresponding child.
context_after:         self.projections.get(&(place, elem)).copied()