Bug 18849 – std.allocator: AllocatorList uses deallocate and ignores return value in deallocateAll

AllocatorList's deallocateAll has the code: if (special) { special.deallocate(allocators); } This has the issues: - The return value is ignored. If the deallocation failed, the failure should be communicated to the caller. Currently, this causes a silent memory leak. - Some allocators, such as Region, can deallocateAll, but cannot deallocate. Ideally the complete inability to deallocate() should be detected at compile-time, and such combinations rejected. - The documentation of AllocatorList has two examples of using it with Region, which will not work (leak memory) due to the above.

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