{"ast_node_type":"variable","tokens":[{"end":52,"kind":"keyword","start":0,"text":"}"}]}
    } else if let ExprKind::Lit(spanned) = expr.kind
        (diag_item == sym::ptr_null || diag_item == sym::ptr_null_mut).then_some(expr.span)
        && let LitKind::Int(v, _) = spanned.node