@Override
			public void modifyLatest(ProgramDB program) throws Exception {
				AddressSet body1001979 =
					new AddressSet(addr(program, "0x1001979"), addr(program, "0x100199a"));
				createFunction(program, "0x1001979", "FUN_01001979", body1001979);
				Function func = getFunction(program, "0x1001979");
				func.setReturnType(Undefined2DataType.dataType, SourceType.ANALYSIS);

				AddressSet body10029a1 =
					new AddressSet(addr(program, "0x10029a1"), addr(program, "0x10029ca"));
				createFunction(program, "0x10029a1", "FUN_010029a1", body10029a1);
				func = getFunction(program, "0x10029a1");
				func.setReturnType(Undefined2DataType.dataType, SourceType.ANALYSIS);
			}
Test the merge of the versioned program's listing.
Ghidra/Features/Base/src/test.slow/java/ghidra/app/merge/listing/FunctionMergeManagerTest.java