syntax_data: {"ast_node_type":"variable","tokens":[{"end":29,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:                 let emitter =
context_before:             if let HumanReadableErrorType::AnnotateSnippet = kind {
context_after:                     AnnotateSnippetEmitter::new(source_map, translator, short, macro_backtrace);