Extern function fails to resolve

[Grimelios]

Consider two projects A and B. Project B (a library) is shown below:

namespace B
{
    public class Application
    {
        public this()
        {
            Struct.Extern();
        }
    }

    public struct Struct : this(int value)
    {
        public static extern Self Extern();
    }
}

Project A (a console application that depends on B) looks like this:

using B;

namespace A
{
    static
    {
        public static void Main()
        {
            // Fails to compile with error LNK2019
            let app = new Application();
        }
    }
}

namespace B
{
    public extension Struct
    {
        public static override void Extern()
        {
        }
    }
}

This code fails to compile with error LNK2019, stating that Struct.Extern is an unresolved external symbol. Modifying Main to call Struct.Extern directly compiles successfully.

public static void Main()
{
    // Success!
    Struct.Extern();
}