syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"#[note(session_feature_suggest_upgrade_compiler)]"}]}
source_snippet: #[note(session_feature_suggest_upgrade_compiler)]
context_before: #[derive(Subdiagnostic)]
context_after: pub(crate) struct SuggestUpgradeCompiler {