[Issue 24202] std.range.chain ganerated object has wrong .init

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=24202

--- Comment #3 from Dragos Carp <dragoscarp at gmail.com> ---
It broke functioning code. It is a regression!

https://github.com/dcarp/protobuf-d/issues/43


chain(...).init should be consistent. If it reports non-empty, what should be
the result of front?

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