"""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 parameter and global

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():

>>> obj.None = 1
Traceback (most recent call last):
SyntaxError: invalid syntax

>>> None = 1
Traceback (most recent call last):
SyntaxError: cannot assign to None

>>> obj.True = 1
Traceback (most recent call last):
SyntaxError: invalid syntax

>>> True = 1
Traceback (most recent call last):
SyntaxError: cannot assign to True

>>> (True := 1)
Traceback (most recent call last):
SyntaxError: cannot use assignment expressions with True

>>> obj.__debug__ = 1
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__

>>> __debug__ = 1
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__

>>> (__debug__ := 1)
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__

>>> f() = 1
Traceback (most recent call last):
SyntaxError: cannot assign to function call

>>> del f()
Traceback (most recent call last):
SyntaxError: cannot delete function call

>>> a + 1 = 2
Traceback (most recent call last):
SyntaxError: cannot assign to operator

>>> (x for x in x) = 1
Traceback (most recent call last):
SyntaxError: cannot assign to generator expression

>>> 1 = 1
Traceback (most recent call last):
SyntaxError: cannot assign to literal

>>> "abc" = 1
Traceback (most recent call last):
SyntaxError: cannot assign to literal

>>> b"" = 1
Traceback (most recent call last):
SyntaxError: cannot assign to literal

>>> ... = 1
Traceback (most recent call last):
SyntaxError: cannot assign to Ellipsis

>>> `1` = 1
Traceback (most recent call last):
SyntaxError: invalid syntax

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: cannot assign to literal

>>> (a, True, c) = (1, 2, 3)
Traceback (most recent call last):
SyntaxError: cannot assign to True

>>> (a, __debug__, c) = (1, 2, 3)
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__

>>> (a, *True, c) = (1, 2, 3)
Traceback (most recent call last):
SyntaxError: cannot assign to True

>>> (a, *__debug__, c) = (1, 2, 3)
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__

>>> [a, b, c + 1] = [1, 2, 3]
Traceback (most recent call last):
SyntaxError: cannot assign to operator

>>> a if 1 else b = 1
Traceback (most recent call last):
SyntaxError: cannot assign to conditional expression

From compiler_complex_args():

>>> def f(None=1):
...     pass
Traceback (most recent call last):
SyntaxError: invalid syntax


From ast_for_arguments():

>>> def f(x, y=1, z):
...     pass
Traceback (most recent call last):
SyntaxError: non-default argument follows default argument

>>> def f(x, None):
...     pass
Traceback (most recent call last):
SyntaxError: invalid syntax

>>> def f(*None):
...     pass
Traceback (most recent call last):
SyntaxError: invalid syntax

>>> def f(**None):
...     pass
Traceback (most recent call last):
SyntaxError: invalid syntax


From ast_for_funcdef():

>>> def None(x):
...     pass
Traceback (most recent call last):
SyntaxError: invalid syntax


From ast_for_call():

>>> def f(it, *varargs, **kwargs):
...     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
>>> f(x for x in L, y=1)
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized
>>> f(x for x in L, *[])
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized
>>> f(x for x in L, **{})
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized
>>> f(L, x for x in L)
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized
>>> f(x for x in L, y for y in L)
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized
>>> f(x for x in L,)
Traceback (most recent call last):
SyntaxError: Generator expression must be parenthesized
>>> f((x for x in L), 1)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> class C(x for x in L):
...     pass
Traceback (most recent call last):
SyntaxError: invalid syntax

>>> def g(*args, **kwargs):
...     print(args, sorted(kwargs.items()))
>>> g(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
...   20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
...   38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55,
...   56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73,
...   74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91,
...   92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
...   108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121,
...   122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135,
...   136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149,
...   150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163,
...   164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177,
...   178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
...   192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205,
...   206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219,
...   220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233,
...   234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247,
...   248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261,
...   262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275,
...   276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 289,
...   290, 291, 292, 293, 294, 295, 296, 297, 298, 299)  # doctest: +ELLIPSIS
(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, ..., 297, 298, 299) []

>>> g(a000=0, a001=1, a002=2, a003=3, a004=4, a005=5, a006=6, a007=7, a008=8,
...   a009=9, a010=10, a011=11, a012=12, a013=13, a014=14, a015=15, a016=16,
...   a017=17, a018=18, a019=19, a020=20, a021=21, a022=22, a023=23, a024=24,
...   a025=25, a026=26, a027=27, a028=28, a029=29, a030=30, a031=31, a032=32,
...   a033=33, a034=34, a035=35, a036=36, a037=37, a038=38, a039=39, a040=40,
...   a041=41, a042=42, a043=43, a044=44, a045=45, a046=46, a047=47, a048=48,
...   a049=49, a050=50, a051=51, a052=52, a053=53, a054=54, a055=55, a056=56,
...   a057=57, a058=58, a059=59, a060=60, a061=61, a062=62, a063=63, a064=64,
...   a065=65, a066=66, a067=67, a068=68, a069=69, a070=70, a071=71, a072=72,
...   a073=73, a074=74, a075=75, a076=76, a077=77, a078=78, a079=79, a080=80,
...   a081=81, a082=82, a083=83, a084=84, a085=85, a086=86, a087=87, a088=88,
...   a089=89, a090=90, a091=91, a092=92, a093=93, a094=94, a095=95, a096=96,
...   a097=97, a098=98, a099=99, a100=100, a101=101, a102=102, a103=103,
...   a104=104, a105=105, a106=106, a107=107, a108=108, a109=109, a110=110,
...   a111=111, a112=112, a113=113, a114=114, a115=115, a116=116, a117=117,
...   a118=118, a119=119, a120=120, a121=121, a122=122, a123=123, a124=124,
...   a125=125, a126=126, a127=127, a128=128, a129=129, a130=130, a131=131,
...   a132=132, a133=133, a134=134, a135=135, a136=136, a137=137, a138=138,
...   a139=139, a140=140, a141=141, a142=142, a143=143, a144=144, a145=145,
...   a146=146, a147=147, a148=148, a149=149, a150=150, a151=151, a152=152,
...   a153=153, a154=154, a155=155, a156=156, a157=157, a158=158, a159=159,
...   a160=160, a161=161, a162=162, a163=163, a164=164, a165=165, a166=166,
...   a167=167, a168=168, a169=169, a170=170, a171=171, a172=172, a173=173,
...   a174=174, a175=175, a176=176, a177=177, a178=178, a179=179, a180=180,
...   a181=181, a182=182, a183=183, a184=184, a185=185, a186=186, a187=187,
...   a188=188, a189=189, a190=190, a191=191, a192=192, a193=193, a194=194,
...   a195=195, a196=196, a197=197, a198=198, a199=199, a200=200, a201=201,
...   a202=202, a203=203, a204=204, a205=205, a206=206, a207=207, a208=208,
...   a209=209, a210=210, a211=211, a212=212, a213=213, a214=214, a215=215,
...   a216=216, a217=217, a218=218, a219=219, a220=220, a221=221, a222=222,
...   a223=223, a224=224, a225=225, a226=226, a227=227, a228=228, a229=229,
...   a230=230, a231=231, a232=232, a233=233, a234=234, a235=235, a236=236,
...   a237=237, a238=238, a239=239, a240=240, a241=241, a242=242, a243=243,
...   a244=244, a245=245, a246=246, a247=247, a248=248, a249=249, a250=250,
...   a251=251, a252=252, a253=253, a254=254, a255=255, a256=256, a257=257,
...   a258=258, a259=259, a260=260, a261=261, a262=262, a263=263, a264=264,
...   a265=265, a266=266, a267=267, a268=268, a269=269, a270=270, a271=271,
...   a272=272, a273=273, a274=274, a275=275, a276=276, a277=277, a278=278,
...   a279=279, a280=280, a281=281, a282=282, a283=283, a284=284, a285=285,
...   a286=286, a287=287, a288=288, a289=289, a290=290, a291=291, a292=292,
...   a293=293, a294=294, a295=295, a296=296, a297=297, a298=298, a299=299)
...  # doctest: +ELLIPSIS
() [('a000', 0), ('a001', 1), ('a002', 2), ..., ('a298', 298), ('a299', 299)]

>>> class C:
...     def meth(self, *args):
...         return args
>>> obj = C()
>>> obj.meth(
...   0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
...   20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37,
...   38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55,
...   56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73,
...   74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91,
...   92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107,
...   108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121,
...   122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135,
...   136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149,
...   150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163,
...   164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177,
...   178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
...   192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205,
...   206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219,
...   220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233,
...   234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247,
...   248, 249, 250, 251, 252, 253, 254, 255, 256, 257, 258, 259, 260, 261,
...   262, 263, 264, 265, 266, 267, 268, 269, 270, 271, 272, 273, 274, 275,
...   276, 277, 278, 279, 280, 281, 282, 283, 284, 285, 286, 287, 288, 289,
...   290, 291, 292, 293, 294, 295, 296, 297, 298, 299)  # doctest: +ELLIPSIS
(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, ..., 297, 298, 299)

>>> f(lambda x: x[0] = 3)
Traceback (most recent call last):
SyntaxError: expression cannot contain assignment, perhaps you meant "=="?

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: expression cannot contain assignment, perhaps you meant "=="?
>>> f(a or b=1)
Traceback (most recent call last):
SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
>>> f(x.y=1)
Traceback (most recent call last):
SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
>>> f((x)=2)
Traceback (most recent call last):
SyntaxError: expression cannot contain assignment, perhaps you meant "=="?
>>> f(True=2)
Traceback (most recent call last):
SyntaxError: cannot assign to True
>>> f(__debug__=1)
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__


More set_context():

>>> (x for x in x) += 1
Traceback (most recent call last):
SyntaxError: cannot assign to generator expression
>>> None += 1
Traceback (most recent call last):
SyntaxError: cannot assign to None
>>> __debug__ += 1
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__
>>> f() += 1
Traceback (most recent call last):
SyntaxError: cannot assign to function call


Test continue in finally in weird combinations.

continue in for loop under finally should be ok.