https://issues.dlang.org/show_bug.cgi?id=21201

          Issue ID: 21201
           Summary: let std.uuid.parseUUID accept input ranges whose
                    elements are char or wchar, not just dchar
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: n8sh.secondary@hotmail.com

All characters of interest to `std.uuid.parseUUID` are ASCII so there is no reason it cannot work on a range of chars or wchars.

--