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[GNAT] This restriction prohibits any instance of default initialization of variables. The binder implements a consistency rule which prevents any unit compiled without the restriction from with'ing a unit with the restriction (this allows the generation of initialization procedures to be skipped, since you can be sure that no call is ever generated to an initialization procedure in a unit with the restriction active). If used in conjunction with Initialize_Scalars or Normalize_Scalars, the effect is to prohibit all cases of variables declared without a specific initializer (including the case of OUT scalar parameters).