Error not callable with argument types but types matches

[anonymous via Digitalmars-d-learn]

On 08.11.2015 08:17, Sliya wrote:
> I am on Mac OS, but I still don't get it. If the import was not
> case-sensitive, I would not have any error since the good file would
> have been loaded... Here I have no error saying file not found yet the
> file is not loaded. I'd love to know what really happens.

The file system is case insensitive. That means when dmd opens noise.d 
or Noise.d it gets the same contents both times. So both `import noise;` 
and `import Noise;` succeed.

But the module name is case sensitive. `import noise;` results in a 
module `noise`, while `import Noise;` results in a module `Noise`. And 
they're not the same. They're different modules.

So when cell.d does `import Noise;` and perlin.d does `import noise;`, 
then they're using two different, incompatible Noise interfaces.