hugo-theme-relearn/layouts/shortcodes/include.html

{{- if (.Get "showfirstheading") }}
  {{- $filepath := "[virtual file]" }}{{ with and .Page .Page.File .Page.File.Filename }}{{ $filepath = . }}{{ end }}
  {{- warnf "%q: UNSUPPORTED parameter 'showfirstheading' for shortcode 'include' found, use 'hidefirstheading' instead; see https://mcshelby.github.io/hugo-theme-relearn/introduction/releasenotes/4/#4-2-0" $filepath }}
{{- end }}
{{- partial "shortcodes/include.html" (dict
  "page"             .Page
  "file"             (.Get "file" | default (.Get 0))
  "hidefirstheading" (.Get "hidefirstheading" | default (.Get 1))
) }}