text: """This module tests SyntaxErrors.
  
  Here's an example of the sort of thing that is tested.
  
  >>> def f(x):
  ...     global x
  Traceback (most recent call last):
  SyntaxError: name 'x' is local and global (<doctest test.test_syntax[0]>, line 1)
  
  The tests are all raise SyntaxErrors.  They were created by checking
  each C call that raises SyntaxError.  There are several modules that
  raise these exceptions-- ast.c, compile.c, future.c, pythonrun.c, and
  symtable.c.
  
  The parser itself outlaws a lot of invalid syntax.  None of these
  errors are tested here at the moment.  We should add some tests; since
  there are infinitely many programs with invalid syntax, we would need
  to be judicious in selecting some.
  
  The compiler generates a synthetic module name for code executed by
  doctest.  Since all the code comes from the same module, a suffix like
  [1] is appended to the module name, As a consequence, changing the
  order of tests in this module means renumbering all the errors after
  it.  (Maybe we should enable the ellipsis option for these tests.)
  
  In ast.c, syntax errors are raised by calling ast_error().
  
  Errors from set_context():
  
  TODO(jhylton): "assignment to None" is inconsistent with other messages
  
  >>> obj.None = 1
  Traceback (most recent call last):
  SyntaxError: assignment to None (<doctest test.test_syntax[1]>, line 1)
  
  >>> None = 1
  Traceback (most recent call last):
  SyntaxError: assignment to None (<doctest test.test_syntax[2]>, line 1)
  
  It's a syntax error to assign to the empty tuple.  Why isn't it an
  error to assign to the empty list?  It will always raise some error at
  runtime.
  
  >>> () = 1
  Traceback (most recent call last):
  SyntaxError: can't assign to () (<doctest test.test_syntax[3]>, line 1)
  
  >>> f() = 1
  Traceback (most recent call last):
  SyntaxError: can't assign to function call (<doctest test.test_syntax[4]>, line 1)
  
  >>> del f()
  Traceback (most recent call last):
  SyntaxError: can't delete function call (<doctest test.test_syntax[5]>, line 1)
  
  >>> a + 1 = 2
  Traceback (most recent call last):
  SyntaxError: can't assign to operator (<doctest test.test_syntax[6]>, line 1)
  
  >>> (x for x in x) = 1
  Traceback (most recent call last):
  SyntaxError: can't assign to generator expression (<doctest test.test_syntax[7]>, line 1)
  
  >>> 1 = 1
  Traceback (most recent call last):
  SyntaxError: can't assign to literal (<doctest test.test_syntax[8]>, line 1)
  
  >>> "abc" = 1
  Traceback (most recent call last):
  SyntaxError: can't assign to literal (<doctest test.test_syntax[9]>, line 1)
  
  >>> `1` = 1
  Traceback (most recent call last):
  SyntaxError: can't assign to repr (<doctest test.test_syntax[10]>, line 1)
  
  If the left-hand side of an assignment is a list or tuple, an illegal
  expression inside that contain should still cause a syntax error.
  This test just checks a couple of cases rather than enumerating all of
  them.
  
  >>> (a, "b", c) = (1, 2, 3)
  Traceback (most recent call last):
  SyntaxError: can't assign to literal (<doctest test.test_syntax[11]>, line 1)
  
  >>> [a, b, c + 1] = [1, 2, 3]
  Traceback (most recent call last):
  SyntaxError: can't assign to operator (<doctest test.test_syntax[12]>, line 1)
  
  >>> a if 1 else b = 1
  Traceback (most recent call last):
  SyntaxError: can't assign to conditional expression (<doctest test.test_syntax[13]>, line 1)
  
  From compiler_complex_args():
  
  >>> def f(None=1):
  ...     pass
  Traceback (most recent call last):
  SyntaxError: assignment to None (<doctest test.test_syntax[14]>, line 1)
  
  
  From ast_for_arguments():
  
  >>> def f(x, y=1, z):
  ...     pass
  Traceback (most recent call last):
  SyntaxError: non-default argument follows default argument (<doctest test.test_syntax[15]>, line 1)
  
  >>> def f(x, None):
  ...     pass
  Traceback (most recent call last):
  SyntaxError: assignment to None (<doctest test.test_syntax[16]>, line 1)
  
  >>> def f(*None):
  ...     pass
  Traceback (most recent call last):
  SyntaxError: assignment to None (<doctest test.test_syntax[17]>, line 1)
  
  >>> def f(**None):
  ...     pass
  Traceback (most recent call last):
  SyntaxError: assignment to None (<doctest test.test_syntax[18]>, line 1)
  
  
  From ast_for_funcdef():
  
  >>> def None(x):
  ...     pass
  Traceback (most recent call last):
  SyntaxError: assignment to None (<doctest test.test_syntax[19]>, line 1)
  
  
  From ast_for_call():
  
  >>> def f(it, *varargs):
  ...     return list(it)
  >>> L = range(10)
  >>> f(x for x in L)
  [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
  >>> f(x for x in L, 1)
  Traceback (most recent call last):
  SyntaxError: Generator expression must be parenthesized if not sole argument (<doctest test.test_syntax[23]>, line 1)
  >>> f((x for x in L), 1)
  [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
  
  >>> f(i0,  i1,  i2,  i3,  i4,  i5,  i6,  i7,  i8,  i9,  i10,  i11,
  ...   i12,  i13,  i14,  i15,  i16,  i17,  i18,  i19,  i20,  i21,  i22,
  ...   i23,  i24,  i25,  i26,  i27,  i28,  i29,  i30,  i31,  i32,  i33,
  ...   i34,  i35,  i36,  i37,  i38,  i39,  i40,  i41,  i42,  i43,  i44,
  ...   i45,  i46,  i47,  i48,  i49,  i50,  i51,  i52,  i53,  i54,  i55,
  ...   i56,  i57,  i58,  i59,  i60,  i61,  i62,  i63,  i64,  i65,  i66,
  ...   i67,  i68,  i69,  i70,  i71,  i72,  i73,  i74,  i75,  i76,  i77,
  ...   i78,  i79,  i80,  i81,  i82,  i83,  i84,  i85,  i86,  i87,  i88,
  ...   i89,  i90,  i91,  i92,  i93,  i94,  i95,  i96,  i97,  i98,  i99,
  ...   i100,  i101,  i102,  i103,  i104,  i105,  i106,  i107,  i108,
  ...   i109,  i110,  i111,  i112,  i113,  i114,  i115,  i116,  i117,
  ...   i118,  i119,  i120,  i121,  i122,  i123,  i124,  i125,  i126,
  ...   i127,  i128,  i129,  i130,  i131,  i132,  i133,  i134,  i135,
  ...   i136,  i137,  i138,  i139,  i140,  i141,  i142,  i143,  i144,
  ...   i145,  i146,  i147,  i148,  i149,  i150,  i151,  i152,  i153,
  ...   i154,  i155,  i156,  i157,  i158,  i159,  i160,  i161,  i162,
  ...   i163,  i164,  i165,  i166,  i167,  i168,  i169,  i170,  i171,
  ...   i172,  i173,  i174,  i175,  i176,  i177,  i178,  i179,  i180,
  ...   i181,  i182,  i183,  i184,  i185,  i186,  i187,  i188,  i189,
  ...   i190,  i191,  i192,  i193,  i194,  i195,  i196,  i197,  i198,
  ...   i199,  i200,  i201,  i202,  i203,  i204,  i205,  i206,  i207,
  ...   i208,  i209,  i210,  i211,  i212,  i213,  i214,  i215,  i216,
  ...   i217,  i218,  i219,  i220,  i221,  i222,  i223,  i224,  i225,
  ...   i226,  i227,  i228,  i229,  i230,  i231,  i232,  i233,  i234,
  ...   i235,  i236,  i237,  i238,  i239,  i240,  i241,  i242,  i243,
  ...   i244,  i245,  i246,  i247,  i248,  i249,  i250,  i251,  i252,
  ...   i253,  i254,  i255)
  Traceback (most recent call last):
  SyntaxError: more than 255 arguments (<doctest test.test_syntax[25]>, line 1)
  
  The actual error cases counts positional arguments, keyword arguments,
  and generator expression arguments separately.  This test combines the
  three.
  
  >>> f(i0,  i1,  i2,  i3,  i4,  i5,  i6,  i7,  i8,  i9,  i10,  i11,
  ...   i12,  i13,  i14,  i15,  i16,  i17,  i18,  i19,  i20,  i21,  i22,
  ...   i23,  i24,  i25,  i26,  i27,  i28,  i29,  i30,  i31,  i32,  i33,
  ...   i34,  i35,  i36,  i37,  i38,  i39,  i40,  i41,  i42,  i43,  i44,
  ...   i45,  i46,  i47,  i48,  i49,  i50,  i51,  i52,  i53,  i54,  i55,
  ...   i56,  i57,  i58,  i59,  i60,  i61,  i62,  i63,  i64,  i65,  i66,
  ...   i67,  i68,  i69,  i70,  i71,  i72,  i73,  i74,  i75,  i76,  i77,
  ...   i78,  i79,  i80,  i81,  i82,  i83,  i84,  i85,  i86,  i87,  i88,
  ...   i89,  i90,  i91,  i92,  i93,  i94,  i95,  i96,  i97,  i98,  i99,
  ...   i100,  i101,  i102,  i103,  i104,  i105,  i106,  i107,  i108,
  ...   i109,  i110,  i111,  i112,  i113,  i114,  i115,  i116,  i117,
  ...   i118,  i119,  i120,  i121,  i122,  i123,  i124,  i125,  i126,
  ...   i127,  i128,  i129,  i130,  i131,  i132,  i133,  i134,  i135,
  ...   i136,  i137,  i138,  i139,  i140,  i141,  i142,  i143,  i144,
  ...   i145,  i146,  i147,  i148,  i149,  i150,  i151,  i152,  i153,
  ...   i154,  i155,  i156,  i157,  i158,  i159,  i160,  i161,  i162,
  ...   i163,  i164,  i165,  i166,  i167,  i168,  i169,  i170,  i171,
  ...   i172,  i173,  i174,  i175,  i176,  i177,  i178,  i179,  i180,
  ...   i181,  i182,  i183,  i184,  i185,  i186,  i187,  i188,  i189,
  ...   i190,  i191,  i192,  i193,  i194,  i195,  i196,  i197,  i198,
  ...   i199,  i200,  i201,  i202,  i203,  i204,  i205,  i206,  i207,
  ...   i208,  i209,  i210,  i211,  i212,  i213,  i214,  i215,  i216,
  ...   i217,  i218,  i219,  i220,  i221,  i222,  i223,  i224,  i225,
  ...   i226,  i227,  i228,  i229,  i230,  i231,  i232,  i233,  i234,
  ...   i235, i236,  i237,  i238,  i239,  i240,  i241,  i242,  i243,
  ...   (x for x in i244),  i245,  i246,  i247,  i248,  i249,  i250,  i251,
  ...    i252=1, i253=1,  i254=1,  i255=1)
  Traceback (most recent call last):
  SyntaxError: more than 255 arguments (<doctest test.test_syntax[26]>, line 1)
  
  >>> f(lambda x: x[0] = 3)
  Traceback (most recent call last):
  SyntaxError: lambda cannot contain assignment (<doctest test.test_syntax[27]>, line 1)
  
  The grammar accepts any test (basically, any expression) in the
  keyword slot of a call site.  Test a few different options.
  
  >>> f(x()=2)
  Traceback (most recent call last):
  SyntaxError: keyword can't be an expression (<doctest test.test_syntax[28]>, line 1)
  >>> f(a or b=1)
  Traceback (most recent call last):
  SyntaxError: keyword can't be an expression (<doctest test.test_syntax[29]>, line 1)
  >>> f(x.y=1)
  Traceback (most recent call last):
  SyntaxError: keyword can't be an expression (<doctest test.test_syntax[30]>, line 1)
  
  
  From ast_for_expr_stmt():
  
  >>> (x for x in x) += 1
  Traceback (most recent call last):
  SyntaxError: augmented assignment to generator expression not possible (<doctest test.test_syntax[31]>, line 1)
  >>> None += 1
  Traceback (most recent call last):
  SyntaxError: assignment to None (<doctest test.test_syntax[32]>, line 1)
  >>> f() += 1
  Traceback (most recent call last):
  SyntaxError: illegal expression for augmented assignment (<doctest test.test_syntax[33]>, line 1)
  
  
  Test continue in finally in weird combinations.
  
  continue in for loop under finally shouuld be ok.
  
      >>> def test():
      ...     try:
      ...         pass
      ...     finally:
      ...         for abc in range(10):
      ...             continue
      ...     print abc
      >>> test()
      9
  
  Start simple, a continue in a finally should not be allowed.
  
      >>> def test():
      ...    for abc in range(10):
      ...        try:
      ...            pass
      ...        finally:
      ...            continue
      Traceback (most recent call last):
        ...
      SyntaxError: 'continue' not supported inside 'finally' clause (<doctest test.test_syntax[36]>, line 6)
  
  This is essentially a continue in a finally which should not be allowed.
  
      >>> def test():
      ...    for abc in range(10):
      ...        try:
      ...            pass
      ...        finally:
      ...            try:
      ...                continue
      ...            except:
      ...                pass
      Traceback (most recent call last):
        ...
      SyntaxError: 'continue' not supported inside 'finally' clause (<doctest test.test_syntax[37]>, line 7)
  
      >>> def foo():
      ...     try:
      ...         pass
      ...     finally:
      ...         continue
      Traceback (most recent call last):
        ...
      SyntaxError: 'continue' not supported inside 'finally' clause (<doctest test.test_syntax[38]>, line 5)
  
      >>> def foo():
      ...     for a in ():
      ...       try:
      ...           pass
      ...       finally:
      ...           continue
      Traceback (most recent call last):
        ...
      SyntaxError: 'continue' not supported inside 'finally' clause (<doctest test.test_syntax[39]>, line 6)
  
      >>> def foo():
      ...     for a in ():
      ...         try:
      ...             pass
      ...         finally:
      ...             try:
      ...                 continue
      ...             finally:
      ...                 pass
      Traceback (most recent call last):
        ...
      SyntaxError: 'continue' not supported inside 'finally' clause (<doctest test.test_syntax[40]>, line 7)
  
      >>> def foo():
      ...  for a in ():
      ...   try: pass
      ...   finally:
      ...    try:
      ...     pass
      ...    except:
      ...     continue
      Traceback (most recent call last):
        ...
      SyntaxError: 'continue' not supported inside 'finally' clause (<doctest test.test_syntax[41]>, line 8)
  
  There is one test for a break that is not in a loop.  The compiler
  uses a single data structure to keep track of try-finally and loops,
  so we need to be sure that a break is actually inside a loop.  If it
  isn't, there should be a syntax error.
  
     >>> try:
     ...     print 1
     ...     break
     ...     print 2
     ... finally:
     ...     print 3
     Traceback (most recent call last):
       ...
     SyntaxError: 'break' outside loop (<doctest test.test_syntax[42]>, line 3)
  
  This should probably raise a better error than a SystemError (or none at all).
  In 2.5 there was a missing exception and an assert was triggered in a debug
  build.  The number of blocks must be greater than CO_MAXBLOCKS.  SF #1565514
  
     >>> while 1:
     ...  while 2:
     ...   while 3:
     ...    while 4:
     ...     while 5:
     ...      while 6:
     ...       while 8:
     ...        while 9:
     ...         while 10:
     ...          while 11:
     ...           while 12:
     ...            while 13:
     ...             while 14:
     ...              while 15:
     ...               while 16:
     ...                while 17:
     ...                 while 18:
     ...                  while 19:
     ...                   while 20:
     ...                    while 21:
     ...                     while 22:
     ...                      break
     Traceback (most recent call last):
       ...
     SystemError: too many statically nested blocks
  
  This tests assignment-context; there was a bug in Python 2.5 where compiling
  a complex 'if' (one with 'elif') would fail to notice an invalid suite,
  leading to spurious errors.
  
     >>> if 1:
     ...   x() = 1
     ... elif 1:
     ...   pass
     Traceback (most recent call last):
       ...
     SyntaxError: can't assign to function call (<doctest test.test_syntax[44]>, line 2)
  
     >>> if 1:
     ...   pass
     ... elif 1:
     ...   x() = 1
     Traceback (most recent call last):
       ...
     SyntaxError: can't assign to function call (<doctest test.test_syntax[45]>, line 4)
  
     >>> if 1:
     ...   x() = 1
     ... elif 1:
     ...   pass
     ... else:
     ...   pass
     Traceback (most recent call last):
       ...
     SyntaxError: can't assign to function call (<doctest test.test_syntax[46]>, line 2)
  
     >>> if 1:
     ...   pass
     ... elif 1:
     ...   x() = 1
     ... else:
     ...   pass
     Traceback (most recent call last):
       ...
     SyntaxError: can't assign to function call (<doctest test.test_syntax[47]>, line 4)
  
     >>> if 1:
     ...   pass
     ... elif 1:
     ...   pass
     ... else:
     ...   x() = 1
     Traceback (most recent call last):
       ...
     SyntaxError: can't assign to function call (<doctest test.test_syntax[48]>, line 6)
  
  >>> f(a=23, a=234)
  Traceback (most recent call last):
     ...
  SyntaxError: keyword argument repeated (<doctest test.test_syntax[49]>, line 1)
  
  """
  
  import re
  import unittest
  import warnings
  
  from test import test_support
  
  class SyntaxTestCase(unittest.TestCase):
  
      def _check_error(self, code, errtext,
                       filename="<testcase>", mode="exec", subclass=None):
          """Check that compiling code raises SyntaxError with errtext.
  
          errtest is a regular expression that must be present in the
          test of the exception raised.  If subclass is specified it
          is the expected subclass of SyntaxError (e.g. IndentationError).
          """
          try:
              compile(code, filename, mode)
          except SyntaxError, err:
              if subclass and not isinstance(err, subclass):
                  self.fail("SyntaxError is not a %s" % subclass.__name__)
              mo = re.search(errtext, str(err))
              if mo is None:
                  self.fail("%s did not contain '%r'" % (err, errtext,))
          else:
              self.fail("compile() did not raise SyntaxError")
  
      def test_paren_arg_with_default(self):
          self._check_error("def f((x)=23): pass",
                            "parenthesized arg with default")
  
      def test_assign_call(self):
          self._check_error("f() = 1", "assign")
  
      def test_assign_del(self):
          self._check_error("del f()", "delete")
  
      def test_global_err_then_warn(self):
          # Bug tickler:  The SyntaxError raised for one global statement
          # shouldn't be clobbered by a SyntaxWarning issued for a later one.
          source = re.sub('(?m)^ *:', '', """\
              :def error(a):
              :    global a  # SyntaxError
              :def warning():
              :    b = 1
              :    global b  # SyntaxWarning
              :""")
          warnings.filterwarnings(action='ignore', category=SyntaxWarning)
          self._check_error(source, "global")
          warnings.filters.pop(0)
  
      def test_break_outside_loop(self):
          self._check_error("break", "outside loop")
  
      def test_delete_deref(self):
          source = re.sub('(?m)^ *:', '', """\
              :def foo(x):
              :  def bar():
              :    print x
              :  del x
              :""")
          self._check_error(source, "nested scope")
  
      def test_unexpected_indent(self):
          self._check_error("foo()\n bar()\n", "unexpected indent",
                            subclass=IndentationError)
  
      def test_no_indent(self):
          self._check_error("if 1:\nfoo()", "expected an indented block",
                            subclass=IndentationError)
  
      def test_bad_outdent(self):
          self._check_error("if 1:\n  foo()\n bar()",
                            "unindent does not match .* level",
                            subclass=IndentationError)
  
      def test_kwargs_last(self):
          self._check_error("int(base=10, '2')", "non-keyword arg")
  
  def test_main():
      test_support.run_unittest(SyntaxTestCase)
      from test import test_syntax
      with test_support._check_py3k_warnings(("backquote not supported",
                                               SyntaxWarning)):
          test_support.run_doctest(test_syntax, verbosity=True)
  
  if __name__ == "__main__":
      test_main()
  