Fix: 'iter' builtin should accept 'Object'.

Author: fangerer

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/BuiltinFunctions.java

@@ -1113,7 +1113,7 @@ public abstract static class MinNode extends MinMaxNode {
     public abstract static class NextNode extends PythonBuiltinNode {
 
         @Specialization
-        public Object next(PythonObject iterator, PNone defaultObject,
+        public Object next(Object iterator, PNone defaultObject,
                         @Cached("create()") GetNextNode next,
                         @Cached("createBinaryProfile()") ConditionProfile errorProfile) {
             try {
@@ -1123,11 +1123,6 @@ public Object next(PythonObject iterator, PNone defaultObject,
                 throw raise(TypeError, "'%p' object is not an iterator", iterator);
             }
         }
-
-        @Specialization
-        public Object next(Object iterator, Object defaultObject) {
-            throw new RuntimeException("Unsupported iterator " + iterator);
-        }
     }
 
     // ord(c)