default ExpressionMatcher<OperandValue> opnd(ExpressionMatcher<?> def) {
			return new OperandValueMatcher(def);
		}
Match an operand value

<p>
Typically, this must wrap any use of a field, since that field is considered an operand
from the constructor's perspective.

@param def the matcher for the operand's defining expression.
@return the operand matcher
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/app/plugin/assembler/sleigh/expr/match/ExpressionMatcher.java