syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"err.subdiagnostic(CliFeatureDiagnosticHelp"}]}
source_snippet:             err.subdiagnostic(CliFeatureDiagnosticHelp { feature });
context_before:         if feature_from_cli {
context_after:         } else if let Some(span) = inject_span {