On Git HEAD, I get a symbol undefined error compiling this nice simple program:
module main;
import std.stdio;
void main()
{
	writefln("Dumped them in %s ms", 0);
}

And the error?
F:\D\dmd3\windows\bin\dmd.exe -debug -g "main.d" 
"F:\D\dmd3\windows\lib\phobos.lib" "-IF:\D\dmd3\src\druntime\import" 
"-IF:\D\dmd3\src\phobos" "-odobj\Debug" 
"-ofF:\Projects\Bugs\undefinedSymbol\bin\Debug\undefinedSymbol.exe"

OPTLINK (R) for Win32  Release 8.00.15
Copyright (C) Digital Mars 1989-2013  All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
obj\Debug\undefinedSymbol.obj(undefinedSymbol) 
 Error 42: Symbol Undefined _D3std5stdio13trustedStdoutFNdNeZS3std5stdio4File
--- errorlevel 1


Also, I set this as P4, as this is really basic stuff that should work but 
doesn't.