In this example all 3 assertions fails. Class Base and Child are imported via static libraries. The issue occus on linux and windows with recent
dmd compiler.

file main.d
-------------------------------------------------------------------
import base, child;

void main()
{
    import std.traits: fullyQualifiedName;
	assert( Object.factory(fullyQualifiedName!Child) !is null);
    assert( createObject(fullyQualifiedName!Base) !is null);
    assert( createObject(fullyQualifiedName!Child) !is null);
}


file base.d
-------------------------------------------------------------------
module base;
class Base { }

Object createObject(string name)
{
  return Object.factory(name);
}


file child.d
--------------------------------------------------------------------
module child;
import base;
class Child: Base { }


The application is compiled via
dmd base -lib
dmd child -lib base.lib
dmd main base.lib child.lib
main
PAUSE