[libcxx-commits] [libcxx] [libc++] Update polymorphic_allocator to never contain a nullptr (PR #148423)

[Louis Dionne via libcxx-commits]

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ldionne wrote:

Let's rename to `libcxx/test/libcxx/mem/mem.res/ctor.nullptr.assert.pass.cpp` or similar?

https://github.com/llvm/llvm-project/pull/148423