https://issues.dlang.org/show_bug.cgi?id=17247

          Issue ID: 17247
           Summary: std.bitmanip.read should not assume sliceable range is
                    assign-copyable to ubyte[].
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: hsteoh@quickfur.ath.cx

std.bitmanip.read wrongly assumes that if an input range has elements that are implicitly convertible to const(ubyte), and it supports slicing operations, then it is possible to copy range elements to a ubyte[] static array using the assignment operator.  Obviously this only works if the range is ubyte[] or a similar built-in type, but it fails horribly for user-defined ubyte ranges that support slicing.

--