Get pip working again (#1532)

Author: slozier

Src/IronPython/Runtime/Bytes.cs

@@ -1163,6 +1163,10 @@ public IEnumerator<byte> GetEnumerator() {
         #region IEnumerable Members
 
         System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() {
+            // workaround for https://github.com/IronLanguages/ironpython3/issues/1519
+            if (GetType() != typeof(Bytes) && PythonTypeOps.TryInvokeUnaryOperator(DefaultContext.Default, this, "__iter__", out object? iter)) {
+                return new PythonEnumerator(iter);
+            }
             return _bytes.GetEnumerator();
         }
 

Tests/test_iterator.py

@@ -306,4 +306,22 @@ def test_discarded_indexer_reduces_empty(self):
         with self.assertRaises(StopIteration):
             it.__next__()
 
+    def test_loop_over_iterable_bytes_subclass(self):
+        # part of https://github.com/IronLanguages/ironpython3/issues/1519
+
+        data = list(range(3))
+        class test(bytes):
+            def __iter__(self):
+                return iter(data)
+
+        # enumerate with for loop
+        res = []
+        for x in test():
+            res.append(x)
+
+        self.assertEqual(res, data)
+
+        # enumerate with list
+        self.assertEqual(list(test()), data)
+
 run_test(__name__)