old_contents: #!/usr/bin/env python
  
  """
  This script takes a list of keywords and generates a testcase, that checks
  if using the keyword as identifier fails, for every keyword. The generate
  test files are set read-only.
  Test for https://github.com/rust-lang/rust/issues/2275
  
  sample usage: src/etc/generate-keyword-tests.py as break
  """
  
  import sys
  import os
  import datetime
  import stat
  
  
  template = """\
  // This file was auto-generated using 'src/etc/generate-keyword-tests.py %s'
  
  fn main() {
      let %s = "foo"; //~ error: expected pattern, found keyword `%s`
  }
  """
  
  test_dir = os.path.abspath(
      os.path.join(os.path.dirname(__file__), '../test/ui/parser')
  )
  
  for kw in sys.argv[1:]:
      test_file = os.path.join(test_dir, 'keyword-%s-as-identifier.rs' % kw)
  
      # set write permission if file exists, so it can be changed
      if os.path.exists(test_file):
          os.chmod(test_file, stat.S_IWUSR)
  
      with open(test_file, 'wt') as f:
          f.write(template % (kw, kw, kw))
  
      # mark file read-only
      os.chmod(test_file, stat.S_IRUSR | stat.S_IRGRP | stat.S_IROTH)
  
new_contents: #!/usr/bin/env python
  
  """
  This script takes a list of keywords and generates a testcase, that checks
  if using the keyword as identifier fails, for every keyword. The generate
  test files are set read-only.
  Test for https://github.com/rust-lang/rust/issues/2275
  
  sample usage: src/etc/generate-keyword-tests.py as break
  """
  
  import sys
  import os
  import stat
  
  
  template = """\
  // This file was auto-generated using 'src/etc/generate-keyword-tests.py %s'
  
  fn main() {
      let %s = "foo"; //~ error: expected pattern, found keyword `%s`
  }
  """
  
  test_dir = os.path.abspath(
      os.path.join(os.path.dirname(__file__), '../test/ui/parser')
  )
  
  for kw in sys.argv[1:]:
      test_file = os.path.join(test_dir, 'keyword-%s-as-identifier.rs' % kw)
  
      # set write permission if file exists, so it can be changed
      if os.path.exists(test_file):
          os.chmod(test_file, stat.S_IWUSR)
  
      with open(test_file, 'wt') as f:
          f.write(template % (kw, kw, kw))
  
      # mark file read-only
      os.chmod(test_file, stat.S_IRUSR | stat.S_IRGRP | stat.S_IROTH)
  
subject: remove unnecessary import statement