Feedvalidator should catch duplicate column names

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What steps will reproduce the problem?
1. Create a trips.txt file with the following columns (note that
trip_headsign column is duplicated) 

What is the expected output? What do you see instead?
An error that the trip_headsign column is duplicated. Instead no error is
reported

What version of the product are you using? On what operating system?
feedvalidator.py 1.1.5 on Linux

Please provide any additional information below.

Original issue reported on code.google.com by emmanu...@google.com on 8 Sep 2008 at 10:56

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Original comment by tom.brow...@gmail.com on 5 Nov 2008 at 8:08

• Added labels: App-FeedValidator, Language-Python

[GoogleCodeExporter]

I've seen this happen a few times recently.

Original comment by tom.brow...@gmail.com on 29 Sep 2009 at 3:40

• Added labels: Priority-High
• Removed labels: Priority-Medium

[GoogleCodeExporter]

Fixed with http://code.google.com/p/googletransitdatafeed/source/detail?r=1169

Original comment by a...@google.com on 19 Nov 2009 at 6:30

• Changed state: Fixed