module main;
import std.stdio;

struct A {}

static A a;

void main() {
	writeln(main.a);
}

this code does not work, because it try to use main function instead of main module. Even error message is wierd: Error: struct A does not overload ()

On Saturday, 29 November 2014 at 19:35:52 UTC, Daniel Kozak wrote:
> module main;
> import std.stdio;
>
> struct A {}
>
> static A a;
>
> void main() {
> 	writeln(main.a);
> }
>
> this code does not work, because it try to use main function instead of main module. Even error message is wierd: Error: struct A does not overload ()

It's a little confusing but it is referring to module main and not the function main. I think the error message is because struct A doesn't define opCall. See:

http://dlang.org/operatoroverloading.html#function-call

I tried to provide an example, but I couldn't get the code to compile myself. :-/

On Saturday, 29 November 2014 at 22:25:46 UTC, Xinok wrote:
> On Saturday, 29 November 2014 at 19:35:52 UTC, Daniel Kozak wrote:
>> module main;
>> import std.stdio;
>>
>> struct A {}
>>
>> static A a;
>>
>> void main() {
>> 	writeln(main.a);
>> }
>>
>> this code does not work, because it try to use main function instead of main module. Even error message is wierd: Error: struct A does not overload ()
>
> It's a little confusing but it is referring to module main and not the function main. I think the error message is because struct A doesn't define opCall.

No, it is refer to main function. And try to call UFCS a(main);

I don't think you can specify look ups with the name of the module in the same module like you can with imported ones. If you want to specify that it is a variable in module scope, use the module scope operator.

writeln(.a); // the leading '.' specifies module scope

Dne Mon, 01 Dec 2014 18:10:35 +0100 Jeremy DeHaan via Digitalmars-d <digitalmars-d@puremagic.com> napsal(a):

> I don't think you can specify look ups with the name of the module in the same module like you can with imported ones. If you want to specify that it is a variable in module scope, use the module scope operator.
>
> writeln(.a); // the leading '.' specifies module scope

You can. It doesn't work only when there is a another symbol with same name as a module. But it makes a sense.

On Monday, 1 December 2014 at 20:29:48 UTC, Daniel Kozak via Digitalmars-d wrote:
> Dne Mon, 01 Dec 2014 18:10:35 +0100 Jeremy DeHaan via Digitalmars-d <digitalmars-d@puremagic.com> napsal(a):
>
>> I don't think you can specify look ups with the name of the module in the same module like you can with imported ones. If you want to specify that it is a variable in module scope, use the module scope operator.
>>
>> writeln(.a); // the leading '.' specifies module scope
>
> You can. It doesn't work only when there is a another symbol with same name as a module. But it makes a sense.

I don't see it mentioned at all in this: http://dlang.org/module.html

It sounds like something was over looked. Either you shouldn't be able to specify with the module name in the same module, or you shouldn't be getting this error.