[libcxx-commits] [libcxx] [libc++] Have `basic_string` call `basic_string_view`'s assume-valid constructor (PR #105441)

[Louis Dionne via libcxx-commits]

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@@ -689,6 +689,9 @@ private:
 
   const value_type* __data_;
   size_type __size_;
+
+  template<class, class, class>
+  friend class basic_string;
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ldionne wrote:

Let's add `#include <__fwd/string.h>`. It's already transitively included via `__fwd/string_view.h`, but let's be IWYU clean.

https://github.com/llvm/llvm-project/pull/105441