Fix for non-CPython: continue iterating during set iteration after finding the first element.

CHANGES.rst

@@ -2,6 +2,15 @@
 Cython Changelog
 ================
 
+0.28.3 (2018-??-??)
+===================
+
+Bugs fixed
+----------
+
+* Set iteration was broken in non-CPython since 0.28.
+
+
 0.28.2 (2018-04-13)
 ===================
 

Cython/Utility/Optimize.c

@@ -462,7 +462,7 @@ static CYTHON_INLINE int __Pyx_set_iter_next(
         }
         (void)orig_length;
         (void)ppos;
-        return 0;
+        return 1;
     }
 #if CYTHON_COMPILING_IN_CPYTHON
     if (unlikely(PySet_GET_SIZE(iter_obj) != orig_length)) {