I have a minimized set of files (thanks DustMite!) that causes a compiler error. If I remove any single import statement, or one of the classes defined in a file (e.g. Libevent2TCPConnection), the error is 'fixed'. However, reading the text of the error, it seems to me that the compiler errors have nothing to do with these imports or these classes. So it must be a bug.

I made a picture of the imports: https://github.com/gittywithexcitement/DMDImportBug/blob/master/imports.png

I have the minimized files in a repository: https://github.com/gittywithexcitement/DMDImportBug

Clone the repository and type 'make' and you should get the errors. Although Sonke Ludwig was having trouble reproducing the compiler errors (but he didn't try with this exact repository), so it may be something specific to my setup, except that I can reproduce it on another machine.

My specifics:
# uname -a:
Linux adesktop 3.11.0-15-generic #23-Ubuntu SMP Mon Dec 9 18:17:04 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

DMD64 D Compiler v2.064 downloaded from http://downloads.dlang.org/releases/2013/dmd_2.064.2-0_amd64.deb