September 01
The following code, when building in Visual D outputs an access violation:

alias I(A...) = A;

interface Foo {
        static foreach(T; I!(int, float))
                void set(T t); // define virt funcs for a list of types
}

class Ass : Foo {
        static foreach(T; I!(int, float))
                void set(T t) {
                        // simplement
                }
}

void main()
{

}

but when compiling from the command line directly works fine.

September 01

On 01.09.2017 21:45, EntangledQuanta wrote:
> The following code, when building in Visual D outputs an access violation:
> 
> alias I(A...) = A;
> 
> interface Foo {
>          static foreach(T; I!(int, float))
>                  void set(T t); // define virt funcs for a list of types
> }
> 
> class Ass : Foo {
>          static foreach(T; I!(int, float))
>                  void set(T t) {
>                          // simplement
>                  }
> }
> 
> void main()
> {
> 
> }
> 
> but when compiling from the command line directly works fine.
> 

It seems "static foreach" doesn't interact well with generating a JSON file with -X. You can disable this in the project configuration page for "Documentation".

Please also consider filing a bug report against dmd at https://issues.dlang.org/