This patch (deco.diff) patches compile.c to recognize
the following form of decorators:

  [list_of_expressions]
  def func(args):
     ...

The list of expressions should contain at least one
element and should not be a list comprehension,
otherwise no special treatment is taken. (An empty list
has no effect either way.)

There's a simple test suite, Lib/test/test_decorators.py.