Raised when an import declaration (or Schooner.Library.fetch!/2)
refers to a library that is not in the registry. :location is the
Schooner.Location of the import form, when it is known.
Raised when an import declaration (or Schooner.Library.fetch!/2)
refers to a library that is not in the registry. :location is the
Schooner.Location of the import form, when it is known.