old_contents: PROTECTED_REGIONS_KEY = "sublime_linter.protected_regions"
  STATUS_KEY = "sublime_linter_status"
  
  WARNING = "warning"
  ERROR = "error"
  WARN_ERR = (WARNING, ERROR)
  INBUILT_ICONS = ("circle", "dot", "bookmark", "none")
  
  LINT_MODES = (
      ('background', 'Lint whenever the text is modified'),
      ('load_save', 'Lint only when a file is loaded or saved'),
      ('manual', 'Lint only when requested')
  )
  
new_contents: PROTECTED_REGIONS_KEY = "sublime_linter.protected_regions"
  STATUS_KEY = "sublime_linter_status"
  
  WARNING = "warning"
  ERROR = "error"
  WARN_ERR = (WARNING, ERROR)
  INBUILT_ICONS = ("circle", "dot", "bookmark", "none")
  
subject: remove unused constant