[Ada] Plug loophole in Possible_Type_For_Conditional_Expression

We need to check that the designated subprograms of access-to-subprogram
types are subtype conformant before registering a common interpretation.

gcc/ada/

	* sem_ch4.adb (Possible_Type_For_Conditional_Expression): Add
	test for subtype conformance in the cases of
	access-to-subprogram types.

diff --git a/gcc/ada/sem_ch4.adb b/gcc/ada/sem_ch4.adb
index d9cd78b..5987b79 100644 (file)
--- a/gcc/ada/sem_ch4.adb
+++ b/gcc/ada/sem_ch4.adb
@@ -7904,11 +7904,15 @@ package body Sem_Ch4 is
 
       elsif Is_Access_Subprogram_Attribute (T1)
         and then Is_Access_Subprogram_Attribute (T2)
+        and then
+          Subtype_Conformant (Designated_Type (T1), Designated_Type (T2))
       then
          return T1;
 
       elsif Is_Access_Protected_Subprogram_Attribute (T1)
         and then Is_Access_Protected_Subprogram_Attribute (T2)
+        and then
+          Subtype_Conformant (Designated_Type (T1), Designated_Type (T2))
       then
          return T1;