Symbolic Support Restrictions

Follow these restrictions when using symbolic support:

Controlled Variables are not supported. For example:
```
DCL A CTL;
```
In the DCL above, there would be no SYMbolic support and CORE='A' would not work.
Use of redefine is not supported. For example:
```
DCL A CHAR(10); 
DCL B DEF A;
```
In the example above, displaying B with CORE would not work.
Adjusted variables are not supported. For example:
```
PROC1 : PROC;
DCL SIZE BIN FIXED(15,0) INIT(10); 
PROC2 : PROC; 
DCL ARRAY(SIZE) BIN(15,0); 
END; 
END;
```
In the example above, an array could not be displayed using CORE.
Individual array entries are not supported. For example:
```
CORE= 'A(5)'
```
This array entry will not work.
Duplicate SYMbol names in the same PROC are not supported. For example:
```
DCL A CHAR(5);
DCL 1 Z,
2 P BIN FIXED, 
2 A BIN FIXED;
```
Using the previous example, when CORE='A' is issued, unpredictable results occur. However, the same variable name in different PROCs is supported. For example:
```
PROC1 : PROC;
DCL A CHAR; 
PROC2 : PROC; 
DCL A BIN FIXED;
```
In the previous example, if CORE='A' were issued in 'PROC1', then the value of 'A' for 'PROC1' would be displayed. If 'PROC2' had been executed to display the value of 'A' in 'PROC2', use the following command: CORE='PROC2:A'.
Variables that use the PL/I ALLOC and FREE commands can be looked at with CORE only after the ALLOC executes and before the FREE executes. For example:
```
DCL A BASED(P);	... cannot view "A".
ALLOC A;	... can use CORE to view "A".
FREE A;	... can no longer view "A".
```

Variables declared in a block can't be viewed until the execution of that PROC's PROC/BEGIN statement. For example:

PROC2 : PROC;
DCL Z CHAR;	... cannot view "P". 
	... can view "Z"..
PROC2 : PROC;
DCL P CHAR; 	... can view "P".
	... can view "Z"..

At least one automatic variable must be declared in a program for SYMbolics to function.
Only one label can appear on a PROC statement. For example:
```
LABEL1 : LABEL2 : PROC ;
```
This is not supported.

Use of the PL/I pre-processor options %NOPRINT, NUMBER, GONUM, and MARGINI is prohibited. If you must use %NOPRINT, call CA.