old_contents: import os
  from functools import lru_cache
  
  from django.core.checks import Warning, register
  from willow.image import Image
  
  
  @lru_cache()
  def has_jpeg_support():
      wagtail_jpg = os.path.join(os.path.dirname(__file__), "check_files", "wagtail.jpg")
      succeeded = True
  
      with open(wagtail_jpg, "rb") as f:
          try:
              Image.open(f)
          except (IOError, Image.LoaderError):
              succeeded = False
  
      return succeeded
  
  
  @lru_cache()
  def has_png_support():
      wagtail_png = os.path.join(os.path.dirname(__file__), "check_files", "wagtail.png")
      succeeded = True
  
      with open(wagtail_png, "rb") as f:
          try:
              Image.open(f)
          except (IOError, Image.LoaderError):
              succeeded = False
  
      return succeeded
  
  
  @register("files")
  def image_library_check(app_configs, **kwargs):
      errors = []
  
      if not has_jpeg_support():
          errors.append(
              Warning(
                  "JPEG image support is not available",
                  hint="Check that the 'libjpeg' library is installed, then reinstall Pillow.",
              )
          )
  
      if not has_png_support():
          errors.append(
              Warning(
                  "PNG image support is not available",
                  hint="Check that the 'zlib' library is installed, then reinstall Pillow.",
              )
          )
  
      return errors
  
new_contents: import os
  from functools import lru_cache
  
  from django.core.checks import Warning, register
  from willow.image import Image
  
  
  @lru_cache()
  def has_jpeg_support():
      wagtail_jpg = os.path.join(os.path.dirname(__file__), "check_files", "wagtail.jpg")
      succeeded = True
  
      with open(wagtail_jpg, "rb") as f:
          try:
              Image.open(f)
          except IOError:
              succeeded = False
  
      return succeeded
  
  
  @lru_cache()
  def has_png_support():
      wagtail_png = os.path.join(os.path.dirname(__file__), "check_files", "wagtail.png")
      succeeded = True
  
      with open(wagtail_png, "rb") as f:
          try:
              Image.open(f)
          except IOError:
              succeeded = False
  
      return succeeded
  
  
  @register("files")
  def image_library_check(app_configs, **kwargs):
      errors = []
  
      if not has_jpeg_support():
          errors.append(
              Warning(
                  "JPEG image support is not available",
                  hint="Check that the 'libjpeg' library is installed, then reinstall Pillow.",
              )
          )
  
      if not has_png_support():
          errors.append(
              Warning(
                  "PNG image support is not available",
                  hint="Check that the 'zlib' library is installed, then reinstall Pillow.",
              )
          )
  
      return errors
  
subject: Remove broken reference to Image.LoaderError