syntax_data: {"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"early_dcx.early_fatal(\"`--diagnostic-width`"}]}
source_snippet:         early_dcx.early_fatal("`--diagnostic-width` must be an positive integer");
context_before:     let diagnostic_width = matches.opt_get("diagnostic-width").unwrap_or_else(|_| {
context_after:     });