core.exception.UnicodeException at src\rt\util\utf.d(400): illegal UTF-16 value

[notna via Digitalmars-d-learn]

Hi all.

somehow, for me, the following is against the "DMD philosophy", 
because this code builds successfully with DMD and the executable 
gives the expected result... but also the below strange 
messages...

CODE:
-----

     module main;

     import std.stdio;
     import std.c.windows.windows;

     pragma(lib, "user32.lib");
     pragma(lib, "Advapi32");


     void main(string[] args)
     {
     	WCHAR lpwszUsername[254];
     	debug writefln("lpwszUsername.sizeof is %s, WCHAR.sizeof is 
%s", lpwszUsername.sizeof, WCHAR.sizeof);
     	// DWORD dUsername2 = lpwszUsername.sizeof / WCHAR.sizeof;
     	DWORD dUsername2 = 254;
     	GetUserNameW(lpwszUsername.ptr, &dUsername2);
     	writefln("Welcome userW %s", lpwszUsername);
     	writeln();
     }

build command:
--------------
- dmd -v -w  main.d

OUTPUT incl. "ERROR":
---------------------

     core.exception.UnicodeException at src\rt\util\utf.d(400): 
illegal UTF-16 value
     ----------------
     0x0041022C
     0x004074B7
     0x004074A1
     0x00406E66
     0x00406DCF
     0x00406D28
     0x00406C41
     0x00406828
     0x0040678C
     0x0040B66E
     0x0040B643
     0x0040B559
     0x00408737
     0x754D338A in BaseThreadInitThunk
     0x7714BF32 in RtlInitializeExceptionChain
     0x7714BF05 in RtlInitializeExceptionChain
     Welcome userW <my account name here>

environment:
------------
- DMD32 D Compiler v2.066.0
- Win7 Enterprise, SP1, 64bit


Any ideas?