[libcxx-commits] [libcxx] [libcxx] adds ranges::fold_left_with_iter and ranges::fold_left (PR #75259)

[via libcxx-commits]

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@@ -0,0 +1,203 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+// <algorithm>
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20
+
+// Checks that `std::ranges::fold_left_with_iter`'s requirements are correct.
+
+#include <algorithm>
+#include <concepts>
+#include <functional>
+#include <iterator>
+#include <ranges>
+
+#include "test_range.h"
+#include "test_iterators.h"
+#include "../requirements.h"
+
+// expected-error@*:* 19 {{no matching function for call to object of type 'const __fold_left_with_iter'}}
+
+void test_iterator() {
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EricWF wrote:

This test is very fragile and will break anytime even the slightest bit of the diagnostic changes.

Also the notes are so loosely coupled to source lines or instantiations it's unclear if they actually attach to the code they're next to.

Consider deleting this test entirely. 

https://github.com/llvm/llvm-project/pull/75259