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LocalSymbols(st)
[
st:=NewStack();
Verify(IsOnStack(st,"c"),False);
PushStackFrame(st,fenced);
AddToStack(st,"a");
AddToStack(st,"b");
Verify(IsOnStack(st,"a"),True);
Verify(IsOnStack(st,"c"),False);
Verify(FindOnStack(st,"a"),{});
FindOnStack(st,"b")["set"]:=True;
Verify(FindOnStack(st,"b"),{{"set",True}});
PushStackFrame(st,unfenced);
AddToStack(st,"c");
Verify(IsOnStack(st,"c"),True);
Verify(IsOnStack(st,"a"),True);
PopStackFrame(st);
PushStackFrame(st,fenced);
AddToStack(st,"c");
Verify(IsOnStack(st,"c"),True);
Verify(IsOnStack(st,"a"),False);
PopStackFrame(st);
PopStackFrame(st);
Verify(StackDepth(st),0);
];
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