old_contents: import copy
  
  
  class SpecMetadata:
      def __init__(self, name) -> None:
          super().__init__()
          self.name = name
          self.owning_module = None
          self.features = []
          self.feature_blocks = {}
          self.feature_variables = {}
          self.where_functions = {}
  
      def set_owning_module(self, owning_module):
          self.owning_module = owning_module
  
      def add_feature(self, feature_name):
          self.features.append(feature_name)
          self.feature_blocks[feature_name] = []
          self.feature_variables[feature_name] = {}
  
      def add_feature_block(self, feature_name, block_type):
          self.feature_blocks[feature_name].append(block_type)
  
      def add_feature_variable(self, feature_name, variable_name):
          if not self.feature_variables[feature_name]:
              self.feature_variables[feature_name] = []
          self.feature_variables[feature_name].append(variable_name)
  
      def add_where_function(self, feature_name, where_function):
          self.where_functions[feature_name] = where_function
  
new_contents: class SpecMetadata:
      def __init__(self, name) -> None:
          super().__init__()
          self.name = name
          self.owning_module = None
          self.features = []
          self.feature_blocks = {}
          self.feature_variables = {}
          self.where_functions = {}
  
      def set_owning_module(self, owning_module):
          self.owning_module = owning_module
  
      def add_feature(self, feature_name):
          self.features.append(feature_name)
          self.feature_blocks[feature_name] = []
          self.feature_variables[feature_name] = {}
  
      def add_feature_block(self, feature_name, block_type):
          self.feature_blocks[feature_name].append(block_type)
  
      def add_feature_variable(self, feature_name, variable_name):
          if not self.feature_variables[feature_name]:
              self.feature_variables[feature_name] = []
          self.feature_variables[feature_name].append(variable_name)
  
      def add_where_function(self, feature_name, where_function):
          self.where_functions[feature_name] = where_function
  
subject: Remove unused import statement