@Override
	public int hashCode() {
		if (hashCode != -1) {
			return hashCode;
		}

		final int prime = 31;
		int result = 1;
		result =
			prime * result + ((locationOfUseAddress == null) ? 0 : locationOfUseAddress.hashCode());
		result = prime * result + refType.hashCode();
		hashCode = result;
		return hashCode;
	}
Returns the program location associated with this reference; may be null.
@return the program location associated with this reference; may be null.
Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/navigation/locationreferences/LocationReference.java