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simple question revisited


Hello again.

Finally searching a bit I found in the Mathematica Book
I found something. For my case of interest it is:

optsfunc = Function[e, Options[Unevaluated[e]], HoldFirst];

Select[Names["*"], MemberQ[ToExpression[#1,
InputForm, optsfunc], SameTest -> _] & ]
{"Complement", "FixedPoint", "FixedPointList", "Intersection", "Union"}

And now there is no message.
As I guess before despite the presence of the message
everything was ok.
Anyway I keep wondering why the message appeared.


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