Clarification about compilation model and the mapping of package names to directory.

[Bruno Medeiros via Digitalmars-d]

Imagine you have a module "main.d" with the line `import xxx.foo;`, and 
you have a file "foo.d" with the module declaration `module xxx.foo;`. 
Now imagine the files are laid out like this:

src/main.d
src/foo.d

Is this valid, should these files compile? Currently DMD will fail if 
each file is compiled individually (because it expects `xxx.foo` to be 
in "src/xxx/foo.d", *but* it will succeed if all files are supplied to 
DMD in the same command-line.

Now, while it might not be the remit of the compiler to define a 
standard of the compilation model, and how source modules are supposed 
to be laid out in a project's directory, it is at the very least the 
responsibility of the DUB spec to do so.

And if DUB is to become the official bundle manager, this behavior 
should be clarified, because actually, this non standard layout 
currently works under DUB (because DUB supplies all source files in one 
single DMD invocation). But DUB and other tools need to know if this is 
actually valid or not, and if it's not, there should be some compiler 
switch to error out on situations like those.


FYI, this issue came up because the DDT IDE failed to understand such 
non-standard module layout, according to a user report ( 
https://groups.google.com/d/msg/ddt-ide/Qf8PeQcujbM/UcdRS7VKLwAJ ).


-- 
Bruno Medeiros
https://twitter.com/brunodomedeiros