https://issues.dlang.org/show_bug.cgi?id=15677

          Issue ID: 15677
           Summary: std.experimental.allocators.expandArray overload with
                    init should take the array by ref.
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: qaston@gmail.com

All other overloads of std.experimental.allocators.expandArray take an array by reference and modify the given array to allow the caller to use the expanded array.

It should be the same for the overload which takes init value, but it looks like that someone forgot to put the ref modifier there.

--