old_contents: # Copyright 2020 Google LLC
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     https://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import builtins
  import itertools
  import keyword
  
  
  # The exceptions to builtins are frequent and useful.
  # They are explicitly allowed message, module, and field names.
  RESERVED_NAMES = frozenset(
      itertools.chain(
          keyword.kwlist,
          set(dir(builtins)) - {"filter", "map", "id", "property"},
      )
  )
  
new_contents: # Copyright 2020 Google LLC
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #     https://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  
  import builtins
  import itertools
  import keyword
  
  
  # The exceptions to builtins are frequent and useful.
  # They are explicitly allowed message, module, and field names.
  RESERVED_NAMES = frozenset(
      itertools.chain(
          keyword.kwlist,
          set(dir(builtins)) - {"filter", "map", "id", "input", "property"},
      )
  )
  
subject: exclude 'input' from reserved names list (#788)