Alias this issue

[togrue]

This broken down testcase doesn't compile, as long there is a alias this.

    struct TestStruct {
        char[] txt;
        alias txt this;
    }

    auto decerealiser = Decerealiser([0, 2, 0x90, 0x91]);
    auto ts = decerealiser.value!TestStruct;
    assert(ts.txt == ['\x90', '\x91']);
    assert(ts.txt.length == 2);

[atilaneves]

This is tricky. The problem here is that the alias this makes TestStruct an InputRange and those are treated differently from "regular" aggregates. I'm not sure how to support ranges and have the example code work.