syntax_data: {"ast_node_type":"other","tokens":[{"end":75,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// `subpatterns`, representing the fields of a [`PatKind::Variant`] or
context_before:     /// Builds and pushes [`MatchPairTree`] subtrees, one for each pattern in
context_after:     /// [`PatKind::Leaf`].