diff -r dcbbff7e6b56 Lib/test/test_syntax.py
--- a/Lib/test/test_syntax.py	Sat Feb 15 13:01:41 2014 +0200
+++ b/Lib/test/test_syntax.py	Sat Feb 15 15:44:05 2014 +0200
@@ -527,7 +527,8 @@
 class SyntaxTestCase(unittest.TestCase):
 
     def _check_error(self, code, errtext,
-                     filename="<testcase>", mode="exec", subclass=None):
+                     filename="<testcase>", mode="exec", subclass=None,
+                     offset=None):
         """Check that compiling code raises SyntaxError with errtext.
 
         errtest is a regular expression that must be present in the
@@ -541,7 +542,13 @@
                 self.fail("SyntaxError is not a %s" % subclass.__name__)
             mo = re.search(errtext, str(err))
             if mo is None:
-                self.fail("SyntaxError did not contain '%r'" % (errtext,))
+                self.fail("SyntaxError did not contain '%r':\n%s" % (errtext, err))
+            if offset is not None and err.offset != offset:
+                self.fail("SyntaxError has an unexpected offset:\n"
+                          "%*s- expected\n"
+                          "%s\n"
+                          "%*s- actual"
+                          % (offset, ".", code, err.offset, "^"))
         else:
             self.fail("compile() did not raise SyntaxError")
 
@@ -584,6 +591,28 @@
     def test_kwargs_last(self):
         self._check_error("int(base=10, '2')", "non-keyword arg")
 
+    def test_bad_literals(self):
+        self._check_error('x = 0b2', 'bad digit in binary literal',
+                          offset=7)
+        self._check_error('x = 0b020', 'bad digit in binary literal',
+                          offset=8)
+        self._check_error('x = 0o8', 'bad digit in octal literal',
+                          offset=7)
+        self._check_error('x = 0o08', 'bad digit in octal literal',
+                          offset=8)
+        self._check_error('x = 0xz', 'bad digit in hex literal',
+                          offset=7)
+        self._check_error('x = 0x0z', 'bad digit in hex literal',
+                          offset=8)
+        self._check_error('x = 0.1e-z', 'bad digit in float literal',
+                          offset=10)
+        self._check_error('x = 0.1e+z', 'bad digit in float literal',
+                          offset=10)
+        self._check_error('x = 007',
+                          'decimal numbers may not have a leading zero',
+                          offset=7)
+
+
 def test_main():
     support.run_unittest(SyntaxTestCase)
     from test import test_syntax