[Issue 10845] New: std.range.Cycle broken for reference type forward ranges

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10845

           Summary: std.range.Cycle broken for reference type forward
                    ranges
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: peter.alexander.au at gmail.com


--- Comment #0 from Peter Alexander <peter.alexander.au at gmail.com> 2013-08-18 04:59:56 PDT ---
import std.stdio;
import std.range;
import std.algorithm;

void main()
{
    auto a = inputRangeObject(iota(3).filter!"true");
    writeln(a.cycle.take(10));
}

Outputs

[0, 1, 2, 0, 1, 2,

then asserts: http://dpaste.dzfl.pl/84de028d

The problem is Cycle.popFront:

void popFront()
{
    _current.popFront();
    if (_current.empty) _current = _original;
}

It should be _current = _original.save, otherwise the _original range is
consumed on the second iteration.

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