syntax_data: {"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// Builds and pushes [`MatchPairTree`] subtrees, one for each pattern in
context_before: impl<'a, 'tcx> Builder<'a, 'tcx> {
context_after:     /// `subpatterns`, representing the fields of a [`PatKind::Variant`] or