syntax_data: {"ast_node_type":"other","tokens":[{"end":61,"kind":"keyword","start":0,"text":"impl<G:"}]}
source_snippet: impl<G: EmissionGuarantee> Diagnostic<'_, G> for TestOutput {
context_before: // manually and avoid the fluent machinery.
context_after:     fn into_diag(self, dcx: DiagCtxtHandle<'_>, level: Level) -> Diag<'_, G> {