[Issue 8792] New: std.algorithm.joiner doesn't return a proper forward range`

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=8792

           Summary: std.algorithm.joiner doesn't return a proper forward
                    range`
           Product: D
           Version: D2
          Platform: All
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: Phobos
        AssignedTo: nobody at puremagic.com
        ReportedBy: hsteoh at quickfur.ath.cx


--- Comment #0 from hsteoh at quickfur.ath.cx 2012-10-09 20:25:31 PDT ---
import std.algorithm;
import std.range;
import std.stdio;

void main() {
    auto x = [[1],[2],[3]];
    auto yy = x.joiner;

    assert(isForwardRange!(typeof(yy)));
    writeln(yy.save);
    writeln(yy);
}

The output is:

[]
[1, 2, 3]

Which means that yy.save didn't save at all! This is a pretty major bug since
it makes joiner unusable where the result needs to be a forward range.

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