syntax_data: {"ast_node_type":"other","tokens":[{"end":42,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// for string suitable for embedding.
context_before:     /// to build artifacts as this may leak local file paths. Use span_to_embeddable_string
context_after:     pub fn span_to_diagnostic_string(&self, sp: Span) -> String {