old_contents: from vint.ast.plugin.scope_plugin.reference_reachability_tester import (
      ReferenceReachabilityTester as ScopePlugin,
      REACHABILITY_FLAG,
      REFERECED_FLAG,
  )
  
new_contents: from vint.ast.plugin.scope_plugin.reference_reachability_tester import (
      ReferenceReachabilityTester as ScopePlugin,
      is_reference_identifier,
      is_reachable_reference_identifier,
      is_declarative_identifier,
      is_referenced_declarative_identifier,
  )
  
subject: Fix importing bug