syntax_data: {"ast_node_type":"other","tokens":[{"end":29,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:         if feature_from_cli {
context_before:     if sess.psess.unstable_features.is_nightly_build() {
context_after:             err.subdiagnostic(CliFeatureDiagnosticHelp { feature });