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HoldAll

HoldAll
is an attribute which specifies that all arguments to a function are to be maintained in an unevaluated form.
  • You can use Evaluate to evaluate the arguments of a HoldAll function in a controlled way.
  • Even when a function has attribute HoldAll, Sequence objects that appear in its arguments are still by default flattened, Unevaluated wrappers are stripped, and upvalues associated with the arguments are used.
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