Merge pull request #6724 from aermicioi/master

Fix issue 17276 added additional case for objects that do not have as root class Object.
merged-on-behalf-of: Nathan Sashihara <n8sh@users.noreply.github.com>

std/traits.d

@@ -4308,6 +4308,10 @@ if (is(T == class))
     {
         alias BaseClassesTuple = AliasSeq!Object;
     }
+    else static if (!is(BaseTypeTuple!T[0] == Object) && !is(BaseTypeTuple!T[0] == class))
+    {
+        alias BaseClassesTuple = AliasSeq!();
+    }
     else
     {
         alias BaseClassesTuple =
@@ -4330,6 +4334,21 @@ if (is(T == class))
     static assert(is(BaseClassesTuple!C3 == AliasSeq!(C2, C1, Object)));
 }
 
+@safe unittest // issue 17276
+{
+    extern (C++) static interface Ext
+    {
+        void someext();
+    }
+
+    extern (C++) static class E : Ext
+    {
+        void someext() {}
+    }
+
+    alias BaseClassesWithNoObject = BaseClassesTuple!E;
+}
+
 @safe unittest
 {
     struct S { }