syntax_data: {"ast_node_type":"other","tokens":[{"end":98,"kind":"keyword","start":0,"text":"MatchPairTree::for_pattern(place_builder,"}]}
source_snippet:                 MatchPairTree::for_pattern(place_builder, pattern, cx, &mut subpairs, extra_data);
context_before:             PatKind::ExpandedConstant { subpattern: ref pattern, .. } => {
context_after:                 None