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5.2.2 No_Dynamic_Sized_Objects

[GNAT] This restriction disallows certain constructs that might lead to the creation of dynamic-sized composite objects (or array or discriminated type). An array subtype indication is illegal if the bounds are not static or references to discriminants of an enclosing type. A discriminated subtype indication is illegal if the type has discriminant-dependent array components or a variant part, and the discriminants are not static. In addition, array and record aggregates are illegal in corresponding cases. Note that this restriction does not forbid access discriminants. It is often a good idea to combine this restriction with No_Secondary_Stack.