This is slightly related to this issue I reported earlier:
https://forum.dlang.org/post/wghdwxptjfcjwptny...@forum.dlang.org
Here's the snippet that captures what fails for me
```dlang
import std.range: ElementType, isRandomAccessRange,
inputRangeObject, sequence, MostDerivedInputRange,
RandomAccessInfinite;
auto seq = sequence!((a, n) => n);
alias SeqType = typeof(seq);
static assert(isRandomAccessRange!SeqType);
static assert(is(MostDerivedInputRange!SeqType ==
RandomAccessInfinite!(ElementType!SeqType)));
auto seqInputRange = seq.inputRangeObject;
static assert(isRandomAccessRange!(typeof(seqInputRange)));
// returns 'false'; I expect this to return 'true' as the most
derived type of 'seq' is of 'RandomAccessInfinite' as
demonstrated above
```
I am compiling using dmd v2.100.1
First, please can someone clarify if the behaviour I expect in
the last line is consistent with the intention of the library?
I have poked around the source and I can see that the
`InputRangeObject` (the object returned by `inputRangeObject`
derives from the return type of the `MostDerivedInputRange`
template, which as shown above returns the correct interface.
However it seems that the implementation of `InputRangeObject`
does not implement `enum bool empty = false` in the case of the
`RandomAccessInfinite` ranges, which leads to the template
`isRandomAccessRange` returning false.
