May 13, 2007
Following the discussion of module declarations, there is still an issue that dates back to 2005 and obviously has been ignored since then. Consider this:

file 1: pack/module1.d
import pack.module2;

file 2: pack/module2.d
import pack.module1;

Compiling the above with 'dmd pack/module1 pack/module2' gives weird messages like 'module module1 is in multiple defined'.

Adding explicit module declarations fixes the issue. It was discussed here:

This issue effectivly renders unnamed modules unusable.