Compiler aborts on a use of attribute 'Img on an object of a record
type, when the attribute reference occurs within a larger expression,
such as a string comparison.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

        * exp_ch4.adb (Process_Transient_In_Expression): Ensure that
        Fin_Context, used to insert finalization code for the
        expression, is a list member: the value returned by
        Find_Hook_Context may be an expression node when the transient
        is part of a larger expression and it has a non-boolean type.
diff --git a/gcc/ada/exp_ch4.adb b/gcc/ada/exp_ch4.adb
--- a/gcc/ada/exp_ch4.adb
+++ b/gcc/ada/exp_ch4.adb
@@ -14952,7 +14952,17 @@ package body Exp_Ch4 is
       --       Hook := null;
       --    end if;
 
+      --  Note that the value returned by Find_Hook_Context may be an
+      --  operator node, which is not a list member. We must locate in the
+      --  tree the proper node after which to inwert the finaliation code.
+
       else
+         while not Is_List_Member (Fin_Context) loop
+            Fin_Context := Parent (Fin_Context);
+         end loop;
+
+         pragma Assert (Present (Fin_Context));
+
          Insert_Action_After (Fin_Context,
            Make_Implicit_If_Statement (Obj_Decl,
              Condition =>


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