syntax_data: {"ast_node_type":"other","tokens":[{"end":95,"kind":"keyword","start":0,"text":"//"}]}
source_snippet:     // Diagnostics are considered side-effects of a query (see `QuerySideEffect`) and are saved
context_before:         "tracks where in rustc a diagnostic was emitted"),
context_after:     // alongside query results and changes to translation options can affect diagnostics - so