protected T evaluateUnique(long offset, int size) {
		throw new PcodeExecutionException(
			String.format("Cannot evaluate unique $U%x:%d", offset, size));
	}
Evaluate a unique variable

<p>
This is only invoked when trying to evaluate a leaf, which should never occur for a unique
variable. Thus, by default, this throws a {@link PcodeExecutionException}.

@param long the offset of the variable
@param size the size of the variable in bytes
@return the value
Ghidra/Debug/ProposedUtils/src/main/java/ghidra/pcode/eval/AbstractVarnodeEvaluator.java