old_contents: """Package for parsing and compiling Python source code
  
  There are several functions defined at the top level that are imported
  from modules contained in the package.
  
  parse(buf, mode="exec") -> AST
      Converts a string containing Python source code to an abstract
      syntax tree (AST).  The AST is defined in compiler.ast.
  
  parseFile(path) -> AST
      The same as parse(open(path))
  
  walk(ast, visitor, verbose=None)
      Does a pre-order walk over the ast using the visitor instance.
      See compiler.visitor for details.
  
  compile(source, filename, mode, flags=None, dont_inherit=None)
      Returns a code object.  A replacement for the builtin compile() function.
  
  compileFile(filename)
      Generates a .pyc file by compiling filename.
  """
  
  import warnings
  
  warnings.warn("The compiler package is deprecated and removed in Python 3.x.",
                DeprecationWarning, stacklevel=2)
  
  from .transformer import parse, parseFile
  from .visitor import walk
  from .pycodegen import compile, compileFile
  
new_contents: """Package for parsing and compiling Python source code
  
  There are several functions defined at the top level that are imported
  from modules contained in the package.
  
  parse(buf, mode="exec") -> AST
      Converts a string containing Python source code to an abstract
      syntax tree (AST).  The AST is defined in compiler.ast.
  
  parseFile(path) -> AST
      The same as parse(open(path))
  
  walk(ast, visitor, verbose=None)
      Does a pre-order walk over the ast using the visitor instance.
      See compiler.visitor for details.
  
  compile(source, filename, mode, flags=None, dont_inherit=None)
      Returns a code object.  A replacement for the builtin compile() function.
  
  compileFile(filename)
      Generates a .pyc file by compiling filename.
  """
  
  from .transformer import parse, parseFile
  from .visitor import walk
  from .pycodegen import compile, compileFile
  
subject: Remove deprecation warning from compiler package