[libcxx-commits] [libcxx] [libc++] Fix {deque, vector}::append_range assuming too much about the types (PR #162438)

[Louis Dionne via libcxx-commits]

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@@ -643,6 +643,42 @@ constexpr void test_sequence_assign_range_move_only() {
   c.assign_range(in);
 }
 
+struct InPlaceOnly {
+  InPlaceOnly(const InPlaceOnly&) = delete;
+  InPlaceOnly(InPlaceOnly&&) = delete;
+  InPlaceOnly& operator=(const InPlaceOnly&) = delete;
+  InPlaceOnly& operator=(InPlaceOnly&&) = delete;
+  constexpr InPlaceOnly() {}
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ldionne wrote:

Can we move this first? I read this as a conversion operator -- usually default constructors come first.

https://github.com/llvm/llvm-project/pull/162438