syntax_data: {"ast_node_type":"function","tokens":[{"end":96,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn new(place: PlaceBuilder<'tcx>, pattern: &Pat<'tcx>, cx: &mut Builder<'_, 'tcx>) -> Self {
context_before:     /// for the given pattern.
context_after:         // Recursively build a tree of match pairs for the given pattern.