syntax_data: {"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"write!(f,"}]}
source_snippet:                     write!(f, "{} ({:?})", source_map.span_to_diagnostic_string(*self), self.ctxt())
context_before:                 if let Some(source_map) = &session_globals.source_map {
context_after:                 } else {