{"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":")"}]}
    ) -> Option<errors::UnusedAssignSuggestion> {
        expr: &'tcx Expr<'tcx>,
        if let hir::Node::Expr(parent) = self.ir.tcx.parent_hir_node(expr.hir_id)