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Cannot find definition of function that returns a path

I want to find the place in the codebase where a path is defined, but searching for the function that creates it gives no results apart from the usage of that function.

For example, see `thread.html.erb`, line 142:

```ruby
<%= link_to 'See the whole thread', comment_thread_path(@comment_thread) %>.
```

This calls a function `comment_thread_path` but searching for this function finds no definition of it.