syntax_data: {"ast_node_type":"other","tokens":[{"end":53,"kind":"keyword","start":0,"text":"serialized_ctxts:"}]}
source_snippet:     serialized_ctxts: Lock<FxHashSet<SyntaxContext>>,
context_before:     /// that we don't accidentally try to encode any more `SyntaxContexts`
context_after:     /// The `SyntaxContexts` that we have serialized (e.g. as a result of encoding `Spans`)