{"ast_node_type":"other","tokens":[{"end":81,"kind":"keyword","start":0,"text":"if"}]}
        if self.features.is_some_and(|features| !features.stmt_expr_attributes())
    pub(crate) fn maybe_emit_expr_attr_err(&self, attr: &Attribute) {
            && !attr.span.allows_unstable(sym::stmt_expr_attributes)