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* exp_ch4.adb (Expand_N_Selected_Component): If the component is the discriminant of a constrained subtype, analyze the copy of the corresponding constraint, because in some cases it may be only partially analyzed. Removes long-lived ??? comments. * exp_ch7.adb (Establish_Transient_Scope): Remove complex code that handled controlled or secondary-stack expressions within the iteration_scheme of a loop. * sem_ch5.adb (Analyze_Iteration_Scheme): Build a block to evaluate bounds that may contain functions calls, to prevent memory leaks when the bound contains a call to a function that uses the secondary stack. (Check_Complex_Bounds): Subsidiary of Analyze_Iteration_Scheme, to generate temporaries for loop bounds that might contain function calls that require secondary stack and/or finalization actions. * sem_ch4.adb (Analyze_Indexed_Component_Form): If the prefix is a selected component and the selector is overloadable (not just a function) treat as function call, Analyze_Call will disambiguate if necessary. (Analyze_Selected_Component): Do not generate an actual subtype for the selected component if expansion is disabled. The actual subtype is only needed for constraint checks. (Analyze_Allocator): If restriction No_Streams is set, then do not permit objects to be declared of a stream type, or of a composite type containing a stream. * restrict.ads: Remove the a-stream entry from Unit_Array, since No_Streams no longer prohibits with'ing this package. * sem_ch3.adb (Build_Derived_Record_Type): If the parent type has discriminants, but the parent base has unknown discriminants, there is no discriminant constraint to inherit. Such a discrepancy can arise when the actual for a formal type with unknown discriminants is a similar private type whose full view has discriminants. (Analyze_Object_Declaration): If restriction No_Streams is set, then do not permit objects to be declared of a stream type, or of a composite type containing a stream. From-SVN: r90906
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