syntax_data: {"ast_node_type":"variable","tokens":[{"end":80,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:             if let Some(TrackElem::Variant(..) | TrackElem::Discriminant) = elem
context_before:             // invalidated by assignment to a variant.
context_after:                 // Only invalidate the other variants, the current one is fine.