@Override
	public void getFixedHandle(FixedHandle hand, ParserWalker walker) throws MemoryAccessException {
		hand.space = walker.getConstSpace();
		hand.offset_space = null;
		hand.offset_offset = patval.getValue(walker);
		hand.size = 0;			// Cannot provide size
	}
A variable with its semantic (and printing) value equal to a fixed
mapping of its pattern
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/processors/sleigh/symbol/ValueSymbol.java