Different Namespaces are not Generated

[Soaryn]

Problem:

PolymorphicStructs that are created in a different namespace than the interface are not generated in their using statements of the generated struct file, breaking compilation.

Example

namespace Playground.ExamplePoly {
    [PolymorphicStruct]
    public interface IPoly {
        public void DoThing();
    }
}

namespace Playground.ExamplePoly.Test {
    public partial struct PolyC : IPoly {
        public void DoThing() { }
    }
}

Current Temporary Workaround

In another IPoly struct, add the using namespace of what ever namespace is nested. These are picked up by the source generator.

[LaPluses]

For those who meet same issue, there can be an easy fix to source code:
At PolymorphicStructsSourceGenerator.cs function GenerateUsingDirectives function, add List<IndividialStructData> individialStructDatas paramters, and then add its namespace:

foreach (var ns in individialStructDatas)
{
    mergedStructWriter.WriteLine($"using {ns.Namespace};");
}