adding comments to make it clear what is happening in this example

miebster · miebster · commit ca2e6eefd2bf · 2013-04-28T11:39:57.000-05:00
diff --git a/examples/exceptions.py b/examples/exceptions.py
@@ -28,3 +28,11 @@
 testSource = "<html<title>Yes</title><body><h1>Man, HTML is <i>great</i>.</h1><p>How could you even <b>think</b> otherwise?</p><img src='HIPPO.JPG'></img><a href='http://twistedmatrix.com'>A Good Website</a></body></html>"
 
 print unwrapGrammar(TinyHTML)(testSource).apply('tag')
+
+# The "tag" rule uses the custom label construct "^ (valid tag)".
+# When this rule fails, the exception raised will say
+# "expected a valid tag".
+#
+# <html<title>Yes</title><body><h1>Man, HTML is <i>great</i>.</h1><p>How could you even <b>think</b> otherwise?</p><img src='HIPPO.JPG'></img><a href='http://twistedmatrix.com'>A Good Website</a></body></html>
+# ^
+# Parse error at line 1, column 5: expected a valid tag. trail: [name attribute tag]
