https://issues.dlang.org/show_bug.cgi?id=22673

          Issue ID: 22673
           Summary: .array of a range with length preallocates without
                    checking if the length was lying or not.
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: maxhaton@gmail.com

```
struct Range
{
    enum size_t length = 100;
    enum size_t evilRealLength = 50;
    size_t idx;
    Type front()
    {
        return Type(0);
    }
    bool empty()
    {
        return idx == evilRealLength;
    }
    void popFront()
    {
        ++idx;
    }
}
```
This will allocate 100 `Type`s but only 50 will be touched, what happens if
those later ones get destructed?

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