| Message ID | 20170425081245.GA36962@adacore.com |
|---|---|
| State | New |
| Headers | show |
Index: exp_attr.adb =================================================================== --- exp_attr.adb (revision 247135) +++ exp_attr.adb (working copy) @@ -1650,8 +1650,8 @@ -- Perform a view conversion when either the argument or the -- formal parameter are of a private type. - if Is_Private_Type (Formal_Typ) - or else Is_Private_Type (Item_Typ) + if Is_Private_Type (Base_Type (Formal_Typ)) + or else Is_Private_Type (Base_Type (Item_Typ)) then Rewrite (Item, Unchecked_Convert_To (Formal_Typ, Relocate_Node (Item)));
When a private tagged record type has some component whose type is the public declaration of a private subtype the compiler may report an spurious error on invalid conversion. The same error may be also reported on package instantiations when the actual type of some generic formal is a private type that is used in the instantiation to declare a component of a tagged type declaration. After this patch the following test compiles without errors. package Pkg1 is type Bounded_String is private; private type Super_String (Max_Length : Positive) is record null; end record; type Bounded_String is new Super_String (10); end; with Pkg1; package Pkg2 is type Key_Type is private; private type Key_Type is new Pkg1.Bounded_String; end; package Pkg2.Child is subtype A_T is Key_Type; -- Test private type Derived is tagged record X : A_T; -- Test end record; end; Command: gcc -c pkg2-child.ads Tested on x86_64-pc-linux-gnu, committed on trunk 2017-04-25 Javier Miranda <miranda@adacore.com> * exp_attr.adb (Rewrite_Stream_Proc_Call): Handle subtypes of private types when performing the view conversion.