new test case for bug found in cython-devel that is fixed in cython-closures

tests/run/pyparam_nogil.pyx

+
+def if_list_nogil(list obj):
+    """
+    >>> if_list_nogil( [] )
+    False
+    >>> if_list_nogil( [1] )
+    True
+    >>> if_list_nogil(None)
+    False
+    """
+    return _if_list_nogil(obj)
+
+cdef bint _if_list_nogil(list obj) nogil:
+    if obj:
+        return True
+    else:
+        return False
+