[gcc r14-3986] ada: Assertion failure on for-of loop iterating on selected component

[Marc Poulhi?s <dkm@gcc.gnu.org>]

https://gcc.gnu.org/g:1f68777549eb0104267bebaa1b94d173e1656d01

commit r14-3986-g1f68777549eb0104267bebaa1b94d173e1656d01
Author: Javier Miranda <miranda@adacore.com>
Date:   Mon Aug 28 18:32:18 2023 +0000

    ada: Assertion failure on for-of loop iterating on selected component
    
    gcc/ada/
    
            * sem_util.adb (Is_Dependent_Component_Of_Mutable_Object): Protect
            access to Entity attribute and add missing code to check function
            selector in a prefix form call.

Diff:
---
 gcc/ada/sem_util.adb | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/gcc/ada/sem_util.adb b/gcc/ada/sem_util.adb
index 35ec296ab93..3229f4e9dd2 100644
--- a/gcc/ada/sem_util.adb
+++ b/gcc/ada/sem_util.adb
@@ -16509,8 +16509,13 @@ package body Sem_Util is
             --  False (it could be a function selector in a prefix form call
             --  occurring in an iterator specification).
 
-            if Ekind (Entity (Selector_Name (Object))) not in
-                 E_Component | E_Discriminant
+            if (Present (Entity (Selector_Name (Object)))
+                  and then Ekind (Entity (Selector_Name (Object))) not in
+                             E_Component | E_Discriminant)
+              or else
+                (Inside_A_Generic
+                   and then Nkind (Parent (Selector_Name (Object)))
+                              = N_Function_Call)
             then
                return False;
             end if;