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Direct Attribute Dependence Cycles


Typical Error Situations

An attribute directly depends on itself.

   ATTR a : sometype;
   
   RULE: root ::= X
   COMPUTE X.a = ADD(1, X.a);
   END;
   
   RULE: X ::= '.'
   END;

results in:

   ERROR: DIRECT cyclic dependencies; 
          see OrdInfo, or use gorto
   ERROR: evaluation order for X.a not found

To locate the error write a .ctl file containing the line

   ORDER: GRAPH DIRECT_RULE;

add it to your .specs or .fw file and make a request for

   foo.specs:OrdInfo>

which results in

    GRAPHS FOR DIRECT DEPENDENCIES
    ==============================

    DIRECT GRAPH FOR RULE rule_1 ROW 3; COL 5
    root ::=   X
    ATNO  CLASS ATNAME DEPENDS ON
    0     INH   X.a    CYCLIC [0]
    END RULE
Here is another OrdInfo Output

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