===================================================================
@@ -10532,11 +10532,34 @@
if Convention (Designated_Type (Btyp)) /=
Convention (Entity (P))
then
- Error_Msg_FE
- ("subprogram & has wrong convention", P, Entity (P));
- Error_Msg_Sloc := Sloc (Btyp);
- Error_Msg_FE ("\does not match & declared#", P, Btyp);
+ -- The rule in 6.3.1 (8) deserves a special error
+ -- message.
+ if Convention (Btyp) = Convention_Intrinsic
+ and then Nkind (Parent (N)) = N_Procedure_Call_Statement
+ and then Is_Entity_Name (Name (Parent (N)))
+ and then Inside_A_Generic
+ then
+ declare
+ Subp : constant Entity_Id :=
+ Entity (Name (Parent (N)));
+ begin
+ if Convention (Subp) = Convention_Intrinsic then
+ Error_Msg_FE ("subprogram and its formal "
+ & "parameters have convention Intrinsic",
+ Parent (N), Subp);
+ Error_Msg_N
+ ("actual cannot be access attribute", N);
+ end if;
+ end;
+
+ else
+ Error_Msg_FE
+ ("subprogram & has wrong convention", P, Entity (P));
+ Error_Msg_Sloc := Sloc (Btyp);
+ Error_Msg_FE ("\does not match & declared#", P, Btyp);
+ end if;
+
if not Is_Itype (Btyp)
and then not Has_Convention_Pragma (Btyp)
then
This patch improves the error message in the case of an attribute reference that is an actual in a call to a subprogram inherited from a generic formal type with unknown discriminants, which makes the subprogram and its formal parameters intrinsic (see RM 6.3.1 (8) and (13)). Compiling l.adb must yield: l.adb:6:08: subprogram and its formal paramenters have convention Intrinsic l.adb:6:22: actual cannot be access attribute with G; generic type D (<>) is new G.T with private; package L is type DT is new D with null record; procedure Foo (A_T : DT; P : access procedure); end; --- package body L is procedure Foo (A_T : DT; P : access procedure) is procedure Q is begin null; end; begin D (A_T).Foo (Q'Access); end Foo; end; --- package G is type T is tagged null record; procedure Foo (A_T : T; P : access procedure); end; Tested on x86_64-pc-linux-gnu, committed on trunk 2017-04-25 Ed Schonberg <schonberg@adacore.com> * sem_attr.adb (Analyze_Attribute, case 'Access): Specialize the error message when the attribute reference is an actual in a call to a subprogram inherited from a generic formal type with unknown discriminants, which makes the subprogram and its formal parameters intrinsic (see RM 6.3.1 (8) and (13)).