[pypy-commit] pypy fix-2211: Add a failing test for non cryptic extended slicing exception message

[Vincent Legoll]

Author: Vincent Legoll <vincent.legoll at idgrilles.fr>
Branch: fix-2211
Changeset: r81391:1d79773109e7
Date: 2015-12-16 19:09 +0100
http://bitbucket.org/pypy/pypy/changeset/1d79773109e7/

Log:	Add a failing test for non cryptic extended slicing exception
	message

diff --git a/rpython/annotator/test/test_annrpython.py b/rpython/annotator/test/test_annrpython.py
--- a/rpython/annotator/test/test_annrpython.py
+++ b/rpython/annotator/test/test_annrpython.py
@@ -3516,6 +3516,19 @@
         s = a.build_types(f, [unicode])
         assert isinstance(s, annmodel.SomeUnicodeString)
 
+    def test_extended_slice(self):
+        def f(start, end, step):
+            return [1, 2, 3][start:end:step]
+
+        a = self.RPythonAnnotator()
+        py.test.raises(AnnotatorError, "a.build_types(f, [int, int, int])")
+        a.build_types(f, [annmodel.SomeInteger(nonneg=True),
+                          annmodel.SomeInteger(nonneg=True),
+                          annmodel.SomeInteger(nonneg=True)])
+        def f(x):
+            return x[:-1]
+
+        a.build_types(f, [str])
 
     def test_negative_slice(self):
         def f(s, e):