test for generator expressions (disabled)

tests/bugs.txt

@@ -9,6 +9,7 @@ missing_baseclass_in_predecl_T262
 cfunc_call_tuple_args_T408
 cascaded_list_unpacking_T467
 compile.cpp_operators
+genexpr_T491
 
 # CPython regression tests that don't current work:
 pyregr.test_threadsignals

tests/run/genexpr_T491.pyx

+
+def test_genexpr():
+    """
+    >>> gen = test_genexpr()
+    >>> list(gen)
+    [0, 1, 2, 3, 4]
+    """
+    return (i for i in range(5))
+
+def test_genexpr_typed():
+    """
+    >>> gen = test_genexpr_typed()
+    >>> list(gen)
+    [0, 1, 2, 3, 4]
+    """
+    cdef int i
+    return (i for i in range(5))
+
+def test_genexpr_funccall():
+    """
+    >>> test_genexpr_funccall()
+    [0, 1, 2, 3, 4]
+    """
+    return list(i for i in range(5))
+
+def test_genexpr_scope():
+    """
+    >>> test_genexpr_scope()
+    ([0, 1, 2, 3, 4], 'abc')
+    """
+    i = 'abc'
+    gen = (i for i in range(5))
+    lst = list(gen)
+    return lst, i
+
+def test_genexpr_closure():
+    """
+    >>> gen = test_genexpr_closure()
+    >>> list(gen)
+    ['a', 'b', 'c']
+    """
+    abc = 'a' + 'b' + 'c'
+    return (c for c in abc)