import std.range, std.algorithm;

void main() {
    auto r = iota(0, 10, 1);
    assert(equal(r, [0, 1, 2, 3, 4, 5, 6, 7, 8, 9][]));
    r = iota(0, 11, 3);
    assert(equal(r, [0, 3, 6, 9][]));
    assert(r[2] == 6);
}

C:\dmd\windows\bin\..\..\src\phobos\std\range.d(1184): Error: this._input.opIndex(index) is not an lvalue
C:\dmd\windows\bin\..\..\src\phobos\std\range.d(4): Error: template instance std.range.iota!(int,int,int) error instantiating

This is caused by 

    static if (isRandomAccessRange!(R))
        ref ElementType!(R) opIndex(uint index)
        {
            enforce(_maxAvailable > index);
            return _input[index];
        }

in std.range.  What is needed is some compile time reflection to determine whether a function returns by reference or value.