syntax_data: {"ast_node_type":"variable","tokens":[{"end":49,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let emitter: Box<DynEmitter> = match output {
context_before:         Translator::with_fallback_bundle(vec![rustc_errors::DEFAULT_LOCALE_RESOURCE], false);
context_after:         config::ErrorOutputType::HumanReadable { kind, color_config } => {