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Yes but it’s err not error. The variable and method names are meant to be concise and highly readable without the CS fluff of Java naming hell.
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I don't think naming convention is the kind of stuff that helps save tokens, specially considering how text is tokenized.

On the other hand, being able to write 'list.filter(v => v.selected)' (or something similar) instead of:

  listFiltered := []Item{}
  for _, item := range list {
    if item.selected {
      listFiltered = append(listFiltered, item)
    }
  }
would save much more tokens.
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You can have that with generic functions, although Go's lambda syntax is too verbose. The slices package has DeleteFunc, which is kind of the opposite. I don't know why they have Filter.

https://pkg.go.dev/slices#DeleteFunc

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