https://issues.dlang.org/show_bug.cgi?id=24128

          Issue ID: 24128
           Summary: array formatting fails to compile with bitsSet
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: regression
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: kroeplin.d@googlemail.com

format!"%-(%s, %)"(BitArray().bitsSet);

fails to compile after dmd-2-103.1:

dmd-2.105.0/linux/bin64/../../src/phobos/std/algorithm/iteration.d(3701,13): Error: `"Attempting to fetch the front of an empty joiner."`

--