There seem to be no sanity checks for version declarations.

The version combinations below are accepted even though they are "insane".
1) Windows linux
2) Win32 Win64
etc..
3) BigEndian LittleEndian
4) X86 AMD64
test cases:
svn://svn.kuehne.cn/dstress/nocompile/command_line_version_(08,09,11..14).d
svn://svn.kuehne.cn/dstress/nocompile/version_(17..22).d

Compiler features can be set.
e.g. dmd -version=D_InlineAsm
test case:
svn://svn.kuehne.cn/dstress/nocompile/command_line_version_15.d

The version "none" can be defined, even though it's stated in the documentation that it is
"Never defined; used to just disable a section of code".
test cases:
svn://svn.kuehne.cn/dstress/nocompile/command_line_version_10.d
svn://svn.kuehne.cn/dstress/nocompile/version_06.d

Thomas