@Override
			public void modifyOriginal(ProgramDB program) {
				// Override fallthrough (0x01006421 to 0x01006423) by setting from 0x01006421 to 0x01006436
				Instruction inst =
					program.getListing().getInstructionAt(addr(program, "0x01006421"));
				inst.setFallThrough(addr(program, "0x01006436"));
				
				ReferenceManager refMgr = program.getReferenceManager();
				assertNotNull(refMgr.getReference(addr(program, "0x01006421"),
					addr(program, "0x01006436"), -1));
			}
Test the merge of the versioned program's listing.
Ghidra/Features/Base/src/test.slow/java/ghidra/app/merge/listing/RefMergerMemTest.java