// EqualityExpression ::= Name '!=' RelationalExpression
pushOnExpressionStack(getUnspecifiedReferenceOptimized());
this.expressionPtr--;
this.expressionLengthPtr--;
this.expressionStack[this.expressionPtr] =
new EqualExpression(
this.expressionStack[this.expressionPtr + 1],
this.expressionStack[this.expressionPtr],
op);
}