void main()

{

    import std.range;

    import std.stdio;

    import std.algorithm;

    import etc.linux.memoryerror;

    static if (is(typeof(registerMemoryErrorHandler)))

        registerMemoryErrorHandler();

​

    ForwardRange!(int)[] listOfRanges;

    listOfRanges ~= iota(1).map!(a => a).inputRangeObject;

    listOfRanges ~= iota(2).map!(a => a).inputRangeObject;

    auto lazyFlattenedRange = joiner(listOfRanges);

    auto d1 = lazyFlattenedRange

                .array // Everything is loaded, no longer lazy

                .chunkBy!(a => a).map!(a => a[0]).inputRangeObject;

    writeln("Non Lazy Chunked Data length: ", d1.walkLength);

​

    // The NEXT part will cause a SEGFAULT.

    lazyFlattenedRange = joiner(listOfRanges); // Reinitializing, since we already iterated it once

    auto d2 = lazyFlattenedRange

                .chunkBy!(a => a).map!(a => a[0]).inputRangeObject;

    writeln("Lazy Chunked Data length: ", d2.walkLength);

}