Can't find tag!

When I do :tag trim_headers , I get 'tag pattern not found' error, even
though this tag is in tags file and tags file is in :set tags. Some
other tags can be found, though (in the same file), and some more tags
also can't be found. It's a python file and this tag refers to function
definition.

How do I debug something like this?

Thanks!, -ak

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