http://d.puremagic.com/issues/show_bug.cgi?id=2897

           Summary: RandomCover docs wrong:  RandomCover needs a random
                    access range.
           Product: D
           Version: 2.029
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Severity: trivial
          Priority: P2
         Component: Phobos
        AssignedTo: bugzi...@digitalmars.com
        ReportedBy: dsim...@yahoo.com


>From RandomCover docs:

"Covers a given range r in a random manner, i.e. goes through each
element of r once and only once, just in a random order. r
must be a forward access range with length."

Reading the source code, it's clear that RandomCover really needs random
access:

    ref ElementType!(Range) front()
    {
        return _input[_current];
    }


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