static CppCompositeType createGG2_syntactic_struct32(VxtManager vxtManager,
			CppCompositeType CC2_struct) {
		CppCompositeType GG2_struct = createStruct32("GG2", 0);
		try {
			if (CC2_struct == null) {
				CC2_struct = createCC2_struct32(vxtManager);
			}
			GG2_struct.addVirtualSyntacticBaseClass(CC2_struct.getComposite(), CC2_struct);
			GG2_struct.addMember("gg21", intT, false, 0);
		}
		catch (Exception e) {
			String msg = "Error in static initialization of test: " + e;
			Msg.error(null, msg);
			throw new AssertException(msg);
		}
		return GG2_struct;
	}
This is not part of the DataTypeManager API... it is only for testing when needing
 to clear results because of another run that creates the same-named types
Ghidra/Features/PDB/src/test/java/ghidra/app/util/pdb/pdbapplicator/CppCompositeTypeTest.java