Cldr.Locale.canonical_language_tag-exclamation-mark

You're seeing just the function canonical_language_tag-exclamation-mark, go back to Cldr.Locale module for more information.
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canonical_language_tag!(language_tag, backend)

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Specs

canonical_language_tag!(locale_name() | Cldr.LanguageTag.t(), Cldr.backend()) ::
  Cldr.LanguageTag.t() | none()

Parses a locale name and returns a Cldr.LanguageTag struct that represents a locale or raises on error.

Arguments

See Cldr.Locale.canonical_language_tag/2 for more information.