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When generating Boolean terminal class, CUP generates code which cannot be executed. The class has to be modified so it can work as expected. CUP Bug or programming error?

As mentioned in title.

The bottom code is generated, but those ifs with value != null and value.setParent are raising errors?


public class BoolLiteral extends Literals {

    private Boolean boolValue;

    public BoolLiteral (Boolean boolValue) {
        this.boolValue=boolValue;
        if(boolValue!=null) boolValue.setParent(this);
    }

    public Boolean getBoolValue() {
        return boolValue;
    }

    public void setBoolValue(Boolean boolValue) {
        this.boolValue=boolValue;
    }

    public void accept(Visitor visitor) {
        visitor.visit(this);
    }

    public void childrenAccept(Visitor visitor) {
        if(boolValue!=null) boolValue.accept(visitor);
    }

    public void traverseTopDown(Visitor visitor) {
        accept(visitor);
        if(boolValue!=null) boolValue.traverseTopDown(visitor);
    }

    public void traverseBottomUp(Visitor visitor) {
        if(boolValue!=null) boolValue.traverseBottomUp(visitor);
        accept(visitor);
    }

    public String toString(String tab) {
        StringBuffer buffer=new StringBuffer();
        buffer.append(tab);
        buffer.append("BoolLiteral(\n");

        if(boolValue!=null)
            buffer.append(boolValue.toString("  "+tab));
        else
            buffer.append(tab+"  null");
        buffer.append("\n");

        buffer.append(tab);
        buffer.append(") [BoolLiteral]");
        return buffer.toString();
    }
}

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