syntax_data: {"ast_node_type":"import","tokens":[{"end":123,"kind":"keyword","start":0,"text":"#[must_use"}]}
source_snippet:     #[must_use = "raise_fatal must be called on the returned ErrorGuaranteed in order to exit with a non-zero status code"]
context_before:     #[allow(rustc::diagnostic_outside_of_impl)]
context_after:     pub fn early_err(&self, msg: impl Into<DiagMessage>) -> ErrorGuaranteed {