[Ada] Regression on overloaded prefixed calls related to prefixed-call extension

gcc/ada/

	* sem_ch4.adb (Try_One_Prefix_Interpretation): Augment test of
	"not Extensions_Allowed" with test for absence of Obj_Type's
	primitive operations Elist, as an additional condition for early
	return from this procedure.

1 files changed, 6 insertions, 2 deletions

diff --git a/gcc/ada/sem_ch4.adb b/gcc/ada/sem_ch4.adb
index eb1a556..1bfd222 100644
--- a/gcc/ada/sem_ch4.adb
+++ b/gcc/ada/sem_ch4.adb
@@ -9558,9 +9558,13 @@ package body Sem_Ch4 is
 
          --  Extension feature: Calls with prefixed views are also supported
          --  for untagged types, so skip the early return when extensions are
-         --  enabled.
+         --  enabled, unless the type doesn't have a primitive operations list
+         --  (such as in the case of predefined types).
 
-         if (not Is_Tagged_Type (Obj_Type) and then not Extensions_Allowed)
+         if (not Is_Tagged_Type (Obj_Type)
+              and then
+                (not Extensions_Allowed
+                  or else not Present (Primitive_Operations (Obj_Type))))
            or else Is_Incomplete_Type (Obj_Type)
          then
             Obj_Type := Prev_Obj_Type;