syntax_data: {"ast_node_type":"other","tokens":[{"end":76,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     ///    * the LHS span needs to end on the same line the RHS span begins,
context_before:     ///    * the syntax contexts of both spans much match,
context_after:     ///    * the LHS span must start at or before the RHS span.