syntax_data: {"ast_node_type":"variable","tokens":[{"end":41,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:         let place = map.find_len(place)?;
context_before:     pub fn try_get_len(&self, place: PlaceRef<'_>, map: &Map<'_>) -> Option<V> {
context_after:         self.try_get_idx(place, map)