syntax_data: {"ast_node_type":"function","tokens":[{"end":90,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn insert_idx(&mut self, target: PlaceIndex, result: ValueOrPlace<V>, map: &Map<'_>) {
context_before:     /// The target place must have been flooded before calling this method.
context_after:         match result {