syntax_data: {"ast_node_type":"other","tokens":[{"end":79,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:                 // Only invalidate the other variants, the current one is fine.
context_before:             if let Some(TrackElem::Variant(..) | TrackElem::Discriminant) = elem
context_after:                 && Some(sibling) != preserved_child