%let x = 1;

%syscall symdel (x, nowarn);

1 %let x = 1;

ERROR: An exception has been encountered. Please contact technical support and provide them with the following traceback information: 
The SAS task name is [Submit] ERROR: Read Access Violation Submit Exception occurred at (B17F11D5) 
Task Traceback Address Frame (DBGHELP API Version 4.0 rev 5) 00007FFCB17F11D5 
00000003B1CFD6F0 saswusym:tkvercn1+0x195 00007FFC86A312E7 
00000003B1CFD6F8 sasxfnc:tkvercn1+0x2A7 000001CDC69E7101 
00000003B1CFD798 sasxmac:tkvercn1+0x260C1 00007FFCB182157A 
00000003B1CFDCA8 sasxmc2:tkvercn1+0x53A 000001CDC69FF5AE 
00000003B1CFE790 sasxmac:tkvercn1+0x3E56E 00007FFC9D58ACAE 
00000003B1CFE798 sasxshel:tkvercn1+0x39C6E 00007FFC9D568D47 
00000003B1CFE9A0 sasxshel:tkvercn1+0x17D07 00007FFC9D56DE0B 
00000003B1CFEA80 sasxshel:tkvercn1+0x1CDCB 00007FFC9D57F408 
00000003B1CFEAE0 sasxshel:tkvercn1+0x2E3C8 00007FFC9D57C5E3 
00000003B1CFEC60 sasxshel:tkvercn1+0x2B5A3 00007FFC9D5A7247 
00000003B1CFF350 sasxshel:tkvercn1+0x56207 00007FFC9D5AAF67 
00000003B1CFF440 sasxshel:tkvercn1+0x59F27 00007FFC9D5ADAE0 
00000003B1CFF490 sasxshel:tkvercn1+0x5CAA0 00007FFC8D6BF5F8 
00000003B1CFF498 sashost:Main+0x152B8 00007FFC8D6C5A1C 
00000003B1CFF7C0 sashost:Main+0x1B6DC 00007FFD08E3257D 
00000003B1CFF7C8 KERNEL32:BaseThreadInitThunk+0x1D 00007FFD0A6EAA58 
00000003B1CFF7F8 ntdll:RtlUserThreadStart+0x28

2 3 %syscall symdel (x, nowarn)

ERROR: Generic critical error.