syntax_data: {"ast_node_type":"enum","tokens":[{"end":81,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // Enum variant fields and enum discriminants alias each another.
context_before:             if let TrackElem::Variant(..) | TrackElem::Discriminant = elem {
context_after:                 self.for_each_variant_sibling(index, sub, f);