static CppCompositeType createH_syntactic_struct32(VxtManager vxtManager,
			CppCompositeType C_struct) {
		CppCompositeType H_struct = createStruct32("H", 0);
		try {
			if (C_struct == null) {
				C_struct = createC_struct32(vxtManager);
			}
			H_struct.addVirtualSyntacticBaseClass(C_struct.getComposite(), C_struct);
			H_struct.addMember("h1", intT, false, 0);
		}
		catch (Exception e) {
			String msg = "Error in static initialization of test: " + e;
			Msg.error(null, msg);
			throw new AssertException(msg);
		}
		return H_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