syntax_data: {"ast_node_type":"function","tokens":[{"end":63,"kind":"keyword","start":0,"text":"pub"}]}
source_snippet: pub fn add_feature_diagnostics_for_issue<G: EmissionGuarantee>(
context_before: #[allow(rustc::diagnostic_outside_of_impl)] // FIXME
context_after:     err: &mut Diag<'_, G>,