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  1. integer i=10;
  2. system.debug(i)
Success #stdin #stdout #stderr 0.01s 8760KB
stdin
1
2
10
42
11
stdout
Object: nil error: did not understand #i
MessageNotUnderstood(Exception)>>signal (ExcHandling.st:254)
UndefinedObject(Object)>>doesNotUnderstand: #i (SysExcept.st:1448)
UndefinedObject>>executeStatements (prog:1)
stderr
./prog:2: expected expression