{"ast_node_type":"other","tokens":[{"end":74,"kind":"keyword","start":0,"text":"//"}]}
        // Duplicate flags are reduced as we go, the last occurrence wins:
    pub(crate) fn handle_cli_feature(&mut self, feature: &str) -> Option<()> {
        // `+feature,-feature,+feature` only enables the feature, and does not record it as both