Odd compiler complaints with import declarations

[Orfeo]

On Friday, 13 September 2013 at 19:57:06 UTC, Andrej Mitrovic 
wrote:
> Add the module declaration "module acme.gadget;" at the top of 
> this file and it should work.

Thanks Andrej...

So, it works also if I add
:// main.d
:import path.to.nonexistent.location.app;

and
// gadget.d
: module path.to.nonexistent.location.app;

but, from TDPL pg 340
"To resolve import path.to.file, for example, the current 
directory is searched first for a subdirectory path/to. If the 
directory exists, the file file.di is queried, and if that is not 
found, the file file.d is queried. If the file has been found, the 
search ends."

Well, if what is written above is true, then why the compiler 
complains?