only test that on static..

tests/unit/src/unit/issues/Issue12415.hx

@@ -8,6 +8,8 @@ class Issue12415 extends Test {
 		eq(true, value == null);
 		eq(false, value != null);
 		eq(true, value.isNull());
+		#if static
 		eq(true, haxe.Int64.isZero((null:Issue12415Abstract)));
+		#end
 	}
 }