syntax_data: {"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     ///   all cache values whose DFN is >= 4 -- in this case, that
context_before:     /// - then we determine that `E` is in error -- we will then clear
context_after:     ///   means the cached value for `F`.