[Ada] Better error for illegal call to abstract operation in instantiations

gcc/ada/

	* sem_ch4.adb (Analyze_Call): In the case where the call is not
	overloaded, check for a call to an abstract nondispatching
	operation and flag an error.

diff --git a/gcc/ada/sem_ch4.adb b/gcc/ada/sem_ch4.adb
index 30c977f4effde2161f9d54b8205e9c843cf97ca7..61c7b4c42d49b78dc4a8b91a9fc7b3218ff0929b 100644 (file)
--- a/gcc/ada/sem_ch4.adb
+++ b/gcc/ada/sem_ch4.adb
@@ -1254,6 +1254,25 @@ package body Sem_Ch4 is
 
          Analyze_One_Call (N, Nam_Ent, True, Success);
 
+         --  If the nonoverloaded interpretation is a call to an abstract
+         --  nondispatching operation, then flag an error and return.
+
+         --  Should this be incorporated in Remove_Abstract_Operations (which
+         --  currently only deals with cases where the name is overloaded)? ???
+
+         if Is_Overloadable (Nam_Ent)
+           and then Is_Abstract_Subprogram (Nam_Ent)
+           and then not Is_Dispatching_Operation (Nam_Ent)
+         then
+            Set_Etype (N, Any_Type);
+
+            Error_Msg_Sloc := Sloc (Nam_Ent);
+            Error_Msg_NE
+              ("cannot call abstract operation& declared#", N, Nam_Ent);
+
+            return;
+         end if;
+
          --  If this is an indirect call, the return type of the access_to
          --  subprogram may be an incomplete type. At the point of the call,
          --  use the full type if available, and at the same time update the