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✏️ Editing: test_syntax.cpython-310.pyc

���1ؙ5Ż��������������������@���sP���d�Z�ddlZddlZddlmZ�G�dd��dej�Zdd��Zedkr&e���dS�dS�)	u����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__

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

>>> f() = 1
Traceback (most recent call last):
SyntaxError: cannot assign to function call here. Maybe you meant '==' instead of '='?

>>> yield = 1
Traceback (most recent call last):
SyntaxError: assignment to yield expression not possible

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

>>> a + 1 = 2
Traceback (most recent call last):
SyntaxError: cannot assign to expression here. Maybe you meant '==' instead of '='?

>>> (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 here. Maybe you meant '==' instead of '='?

>>> "abc" = 1
Traceback (most recent call last):
SyntaxError: cannot assign to literal here. Maybe you meant '==' instead of '='?

>>> b"" = 1
Traceback (most recent call last):
SyntaxError: cannot assign to literal here. Maybe you meant '==' instead of '='?

>>> ... = 1
Traceback (most recent call last):
SyntaxError: cannot assign to ellipsis here. Maybe you meant '==' instead of '='?

>>> `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 expression

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

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

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

>>> a = 42 if True
Traceback (most recent call last):
SyntaxError: expected 'else' after 'if' expression

>>> a = (42 if True)
Traceback (most recent call last):
SyntaxError: expected 'else' after 'if' expression

>>> a = [1, 42 if True, 4]
Traceback (most recent call last):
SyntaxError: expected 'else' after 'if' expression

>>> if True:
...     print("Hello"
...
... if 2:
...    print(123))
Traceback (most recent call last):
SyntaxError: invalid syntax

>>> True = True = 3
Traceback (most recent call last):
SyntaxError: cannot assign to True

>>> x = y = True = z = 3
Traceback (most recent call last):
SyntaxError: cannot assign to True

>>> x = y = yield = 1
Traceback (most recent call last):
SyntaxError: assignment to yield expression not possible

>>> a, b += 1, 2
Traceback (most recent call last):
SyntaxError: 'tuple' is an illegal expression for augmented assignment

>>> (a, b) += 1, 2
Traceback (most recent call last):
SyntaxError: 'tuple' is an illegal expression for augmented assignment

>>> [a, b] += 1, 2
Traceback (most recent call last):
SyntaxError: 'list' is an illegal expression for augmented assignment

Invalid targets in `for` loops and `with` statements should also
produce a specialized error message

>>> for a() in b: pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call

>>> for (a, b()) in b: pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call

>>> for [a, b()] in b: pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call

>>> for (*a, b, c+1) in b: pass
Traceback (most recent call last):
SyntaxError: cannot assign to expression

>>> for (x, *(y, z.d())) in b: pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call

>>> for a, b() in c: pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call

>>> for a, b, (c + 1, d()): pass
Traceback (most recent call last):
SyntaxError: cannot assign to expression

>>> for i < (): pass
Traceback (most recent call last):
SyntaxError: invalid syntax

>>> for a, b
Traceback (most recent call last):
SyntaxError: invalid syntax

>>> with a as b(): pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call

>>> with a as (b, c()): pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call

>>> with a as [b, c()]: pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call

>>> with a as (*b, c, d+1): pass
Traceback (most recent call last):
SyntaxError: cannot assign to expression

>>> with a as (x, *(y, z.d())): pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call

>>> with a as b, c as d(): pass
Traceback (most recent call last):
SyntaxError: cannot assign to function call

>>> with a as b
Traceback (most recent call last):
SyntaxError: expected ':'

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

Comprehensions creating tuples without parentheses
should produce a specialized error message:

>>> [x,y for x,y in range(100)]
Traceback (most recent call last):
SyntaxError: did you forget parentheses around the comprehension target?

>>> {x,y for x,y in range(100)}
Traceback (most recent call last):
SyntaxError: did you forget parentheses around the comprehension target?

# Missing commas in literals collections should not
# produce special error messages regarding missing
# parentheses, but about missing commas instead

>>> [1, 2 3]
Traceback (most recent call last):
SyntaxError: invalid syntax. Perhaps you forgot a comma?

>>> {1, 2 3}
Traceback (most recent call last):
SyntaxError: invalid syntax. Perhaps you forgot a comma?

>>> {1:2, 2:5 3:12}
Traceback (most recent call last):
SyntaxError: invalid syntax. Perhaps you forgot a comma?

>>> (1, 2 3)
Traceback (most recent call last):
SyntaxError: invalid syntax. Perhaps you forgot a comma?

# Make sure soft keywords constructs don't raise specialized
# errors regarding missing commas or other spezialiced errors

>>> match x:
...     y = 3
Traceback (most recent call last):
SyntaxError: invalid syntax

>>> match x:
...     case y:
...        3 $ 3
Traceback (most recent call last):
SyntaxError: invalid syntax

>>> match x:
...     case $:
...        ...
Traceback (most recent call last):
SyntaxError: invalid syntax

>>> match ...:
...     case {**rest, "key": value}:
...        ...
Traceback (most recent call last):
SyntaxError: invalid syntax

>>> match ...:
...     case {**_}:
...        ...
Traceback (most recent call last):
SyntaxError: invalid syntax

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

>>> import ast; ast.parse('''
... def f(
...     *, # type: int
...     a, # type: int
... ):
...     pass
... ''', type_comments=True)
Traceback (most recent call last):
SyntaxError: bare * has associated type comment

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 "=="?

# Check that this error doesn't trigger for names:
>>> f(a={x: for x in {}})
Traceback (most recent call last):
SyntaxError: invalid syntax

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=1)
Traceback (most recent call last):
SyntaxError: cannot assign to True
>>> f(False=1)
Traceback (most recent call last):
SyntaxError: cannot assign to False
>>> f(None=1)
Traceback (most recent call last):
SyntaxError: cannot assign to None
>>> f(__debug__=1)
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__
>>> __debug__: int
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: 'generator expression' is an illegal expression for augmented assignment
>>> None += 1
Traceback (most recent call last):
SyntaxError: 'None' is an illegal expression for augmented assignment
>>> __debug__ += 1
Traceback (most recent call last):
SyntaxError: cannot assign to __debug__
>>> f() += 1
Traceback (most recent call last):
SyntaxError: 'function call' is an illegal expression for augmented assignment

Test continue in finally in weird combinations.

continue in for loop under finally should be ok.

>>> def test():
    ...     try:
    ...         pass
    ...     finally:
    ...         for abc in range(10):
    ...             continue
    ...     print(abc)
    >>> test()
    9

continue in a finally should be ok.

>>> def test():
    ...    for abc in range(10):
    ...        try:
    ...            pass
    ...        finally:
    ...            continue
    ...    print(abc)
    >>> test()
    9

>>> def test():
    ...    for abc in range(10):
    ...        try:
    ...            pass
    ...        finally:
    ...            try:
    ...                continue
    ...            except:
    ...                pass
    ...    print(abc)
    >>> test()
    9

>>> def test():
    ...    for abc in range(10):
    ...        try:
    ...            pass
    ...        finally:
    ...            try:
    ...                pass
    ...            except:
    ...                continue
    ...    print(abc)
    >>> test()
    9

A continue outside loop should not be allowed.

>>> def foo():
    ...     try:
    ...         pass
    ...     finally:
    ...         continue
    Traceback (most recent call last):
      ...
    SyntaxError: 'continue' not properly in loop

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

Misuse of the nonlocal and global statement can lead to a few unique syntax errors.

>>> def f():
   ...     print(x)
   ...     global x
   Traceback (most recent call last):
     ...
   SyntaxError: name 'x' is used prior to global declaration

>>> def f():
   ...     x = 1
   ...     global x
   Traceback (most recent call last):
     ...
   SyntaxError: name 'x' is assigned to before global declaration

>>> def f(x):
   ...     global x
   Traceback (most recent call last):
     ...
   SyntaxError: name 'x' is parameter and global

>>> def f():
   ...     x = 1
   ...     def g():
   ...         print(x)
   ...         nonlocal x
   Traceback (most recent call last):
     ...
   SyntaxError: name 'x' is used prior to nonlocal declaration

>>> def f():
   ...     x = 1
   ...     def g():
   ...         x = 2
   ...         nonlocal x
   Traceback (most recent call last):
     ...
   SyntaxError: name 'x' is assigned to before nonlocal declaration

>>> def f(x):
   ...     nonlocal x
   Traceback (most recent call last):
     ...
   SyntaxError: name 'x' is parameter and nonlocal

>>> def f():
   ...     global x
   ...     nonlocal x
   Traceback (most recent call last):
     ...
   SyntaxError: name 'x' is nonlocal and global

>>> def f():
   ...     nonlocal x
   Traceback (most recent call last):
     ...
   SyntaxError: no binding for nonlocal 'x' found

From SF bug #1705365
   >>> nonlocal x
   Traceback (most recent call last):
     ...
   SyntaxError: nonlocal declaration not allowed at module level

From https://bugs.python.org/issue25973
   >>> class A:
   ...     def f(self):
   ...         nonlocal __x
   Traceback (most recent call last):
     ...
   SyntaxError: no binding for nonlocal '_A__x' found

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: cannot assign to function call here. Maybe you meant '==' instead of '='?

>>> if 1:
   ...   pass
   ... elif 1:
   ...   x() = 1
   Traceback (most recent call last):
     ...
   SyntaxError: cannot assign to function call here. Maybe you meant '==' instead of '='?

>>> if 1:
   ...   x() = 1
   ... elif 1:
   ...   pass
   ... else:
   ...   pass
   Traceback (most recent call last):
     ...
   SyntaxError: cannot assign to function call here. Maybe you meant '==' instead of '='?

>>> if 1:
   ...   pass
   ... elif 1:
   ...   x() = 1
   ... else:
   ...   pass
   Traceback (most recent call last):
     ...
   SyntaxError: cannot assign to function call here. Maybe you meant '==' instead of '='?

>>> if 1:
   ...   pass
   ... elif 1:
   ...   pass
   ... else:
   ...   x() = 1
   Traceback (most recent call last):
     ...
   SyntaxError: cannot assign to function call here. Maybe you meant '==' instead of '='?

Missing ':' before suites:

>>> def f()
   ...     pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> class A
   ...     pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> class R&D:
   ...     pass
   Traceback (most recent call last):
   SyntaxError: invalid syntax

>>> if 1
   ...   pass
   ... elif 1:
   ...   pass
   ... else:
   ...   x() = 1
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> if 1:
   ...   pass
   ... elif 1
   ...   pass
   ... else:
   ...   x() = 1
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> if 1:
   ...   pass
   ... elif 1:
   ...   pass
   ... else
   ...   x() = 1
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> for x in range(10)
   ...   pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> for x in range 10:
   ...   pass
   Traceback (most recent call last):
   SyntaxError: invalid syntax

>>> while True
   ...   pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> with blech as something
   ...   pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> with blech
   ...   pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> with blech, block as something
   ...   pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> with blech, block as something, bluch
   ...   pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> with (blech as something)
   ...   pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> with (blech)
   ...   pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> with (blech, block as something)
   ...   pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> with (blech, block as something, bluch)
   ...   pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> with block ad something:
   ...   pass
   Traceback (most recent call last):
   SyntaxError: invalid syntax

>>> try
   ...   pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> try:
   ...   pass
   ... except
   ...   pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> match x
   ...   case list():
   ...       pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> match x x:
   ...   case list():
   ...       pass
   Traceback (most recent call last):
   SyntaxError: invalid syntax

>>> match x:
   ...   case list()
   ...       pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> match x:
   ...   case [y] if y > 0
   ...       pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

>>> if x = 3:
   ...    pass
   Traceback (most recent call last):
   SyntaxError: invalid syntax. Maybe you meant '==' or ':=' instead of '='?

>>> while x = 3:
   ...    pass
   Traceback (most recent call last):
   SyntaxError: invalid syntax. Maybe you meant '==' or ':=' instead of '='?

>>> if x.a = 3:
   ...    pass
   Traceback (most recent call last):
   SyntaxError: cannot assign to attribute here. Maybe you meant '==' instead of '='?

>>> while x.a = 3:
   ...    pass
   Traceback (most recent call last):
   SyntaxError: cannot assign to attribute here. Maybe you meant '==' instead of '='?

Custom error messages for try blocks that are not followed by except/finally

>>> try:
   ...    x = 34
   ...
   Traceback (most recent call last):
   SyntaxError: expected 'except' or 'finally' block

Ensure that early = are not matched by the parser as invalid comparisons
   >>> f(2, 4, x=34); 1 $ 2
   Traceback (most recent call last):
   SyntaxError: invalid syntax

>>> dict(x=34); x $ y
   Traceback (most recent call last):
   SyntaxError: invalid syntax

>>> dict(x=34, (x for x in range 10), 1); x $ y
   Traceback (most recent call last):
   SyntaxError: invalid syntax

>>> dict(x=34, x=1, y=2); x $ y
   Traceback (most recent call last):
   SyntaxError: invalid syntax

Incomplete dictionary literals

>>> {1:2, 3:4, 5}
   Traceback (most recent call last):
   SyntaxError: ':' expected after dictionary key

>>> {1:2, 3:4, 5:}
   Traceback (most recent call last):
   SyntaxError: expression expected after dictionary key and ':'

>>> {1: *12+1, 23: 1}
   Traceback (most recent call last):
   SyntaxError: cannot use a starred expression in a dictionary value

>>> {1: *12+1}
   Traceback (most recent call last):
   SyntaxError: cannot use a starred expression in a dictionary value

>>> {1: 23, 1: *12+1}
   Traceback (most recent call last):
   SyntaxError: cannot use a starred expression in a dictionary value

>>> {1:}
   Traceback (most recent call last):
   SyntaxError: expression expected after dictionary key and ':'

# Ensure that the error is not raised for syntax errors that happen after sets

>>> {1} $
   Traceback (most recent call last):
   SyntaxError: invalid syntax

# Ensure that the error is not raised for invalid expressions

>>> {1: 2, 3: foo(,), 4: 5}
   Traceback (most recent call last):
   SyntaxError: invalid syntax

>>> {1: $, 2: 3}
   Traceback (most recent call last):
   SyntaxError: invalid syntax

Specialized indentation errors:

>>> while condition:
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'while' statement on line 1

>>> for x in range(10):
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'for' statement on line 1

>>> for x in range(10):
   ...     pass
   ... else:
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'else' statement on line 3

>>> async for x in range(10):
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'for' statement on line 1

>>> async for x in range(10):
   ...     pass
   ... else:
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'else' statement on line 3

>>> if something:
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'if' statement on line 1

>>> if something:
   ...     pass
   ... elif something_else:
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'elif' statement on line 3

>>> if something:
   ...     pass
   ... elif something_else:
   ...     pass
   ... else:
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'else' statement on line 5

>>> try:
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'try' statement on line 1

>>> try:
   ...     something()
   ... except:
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'except' statement on line 3

>>> try:
   ...     something()
   ... except A:
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'except' statement on line 3

>>> try:
   ...     something()
   ... except A:
   ...     pass
   ... finally:
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'finally' statement on line 5

>>> with A:
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'with' statement on line 1

>>> with A as a, B as b:
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'with' statement on line 1

>>> with (A as a, B as b):
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'with' statement on line 1

>>> async with A:
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'with' statement on line 1

>>> async with A as a, B as b:
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'with' statement on line 1

>>> async with (A as a, B as b):
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'with' statement on line 1

>>> def foo(x, /, y, *, z=2):
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after function definition on line 1

>>> class Blech(A):
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after class definition on line 1

>>> match something:
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'match' statement on line 1

>>> match something:
   ...     case []:
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'case' statement on line 2

>>> match something:
   ...     case []:
   ...         ...
   ...     case {}:
   ... pass
   Traceback (most recent call last):
   IndentationError: expected an indented block after 'case' statement on line 4

Make sure that the old "raise X, Y[, Z]" form is gone:
   >>> raise X, Y
   Traceback (most recent call last):
     ...
   SyntaxError: invalid syntax
   >>> raise X, Y, Z
   Traceback (most recent call last):
     ...
   SyntaxError: invalid syntax

Check that an multiple exception types with missing parentheses
raise a custom exception

>>> try:
   ...   pass
   ... except A, B:
   ...   pass
   Traceback (most recent call last):
   SyntaxError: multiple exception types must be parenthesized

>>> try:
   ...   pass
   ... except A, B, C:
   ...   pass
   Traceback (most recent call last):
   SyntaxError: multiple exception types must be parenthesized

>>> try:
   ...   pass
   ... except A, B, C as blech:
   ...   pass
   Traceback (most recent call last):
   SyntaxError: multiple exception types must be parenthesized

>>> try:
   ...   pass
   ... except A, B, C as blech:
   ...   pass
   ... finally:
   ...   pass
   Traceback (most recent call last):
   SyntaxError: multiple exception types must be parenthesized

>>> f(a=23, a=234)
Traceback (most recent call last):
   ...
SyntaxError: keyword argument repeated: a

>>> {1, 2, 3} = 42
Traceback (most recent call last):
SyntaxError: cannot assign to set display here. Maybe you meant '==' instead of '='?

>>> {1: 2, 3: 4} = 42
Traceback (most recent call last):
SyntaxError: cannot assign to dict literal here. Maybe you meant '==' instead of '='?

>>> f'{x}' = 42
Traceback (most recent call last):
SyntaxError: cannot assign to f-string expression here. Maybe you meant '==' instead of '='?

>>> f'{x}-{y}' = 42
Traceback (most recent call last):
SyntaxError: cannot assign to f-string expression here. Maybe you meant '==' instead of '='?

>>> (x, y, z=3, d, e)
Traceback (most recent call last):
SyntaxError: invalid syntax. Maybe you meant '==' or ':=' instead of '='?

>>> [x, y, z=3, d, e]
Traceback (most recent call last):
SyntaxError: invalid syntax. Maybe you meant '==' or ':=' instead of '='?

>>> [z=3]
Traceback (most recent call last):
SyntaxError: invalid syntax. Maybe you meant '==' or ':=' instead of '='?

>>> {x, y, z=3, d, e}
Traceback (most recent call last):
SyntaxError: invalid syntax. Maybe you meant '==' or ':=' instead of '='?

>>> {z=3}
Traceback (most recent call last):
SyntaxError: invalid syntax. Maybe you meant '==' or ':=' instead of '='?

>>> from t import x,
Traceback (most recent call last):
SyntaxError: trailing comma not allowed without surrounding parentheses

>>> from t import x,y,
Traceback (most recent call last):
SyntaxError: trailing comma not allowed without surrounding parentheses

# Check that we dont raise the "trailing comma" error if there is more
# input to the left of the valid part that we parsed.

>>> from t import x,y, and 3
Traceback (most recent call last):
SyntaxError: invalid syntax

>>> (): int
Traceback (most recent call last):
SyntaxError: only single target (not tuple) can be annotated
>>> []: int
Traceback (most recent call last):
SyntaxError: only single target (not list) can be annotated
>>> (()): int
Traceback (most recent call last):
SyntaxError: only single target (not tuple) can be annotated
>>> ([]): int
Traceback (most recent call last):
SyntaxError: only single target (not list) can be annotated

Corner-cases that used to fail to raise the correct error:

>>> def f(*, x=lambda __debug__:0): pass
    Traceback (most recent call last):
    SyntaxError: cannot assign to __debug__

>>> def f(*args:(lambda __debug__:0)): pass
    Traceback (most recent call last):
    SyntaxError: cannot assign to __debug__

>>> def f(**kwargs:(lambda __debug__:0)): pass
    Traceback (most recent call last):
    SyntaxError: cannot assign to __debug__

>>> with (lambda *:0): pass
    Traceback (most recent call last):
    SyntaxError: named arguments must follow bare *

Corner-cases that used to crash:

>>> def f(**__debug__): pass
    Traceback (most recent call last):
    SyntaxError: cannot assign to __debug__

>>> def f(*xx, __debug__): pass
    Traceback (most recent call last):
    SyntaxError: cannot assign to __debug__

>>> import ä £
    Traceback (most recent call last):
    SyntaxError: invalid character '£' (U+00A3)

Invalid pattern matching constructs:

>>> match ...:
    ...   case 42 as _:
    ...     ...
    Traceback (most recent call last):
    SyntaxError: cannot use '_' as a target

>>> match ...:
    ...   case 42 as 1+2+4:
    ...     ...
    Traceback (most recent call last):
    SyntaxError: invalid pattern target

>>> match ...:
    ...   case Foo(z=1, y=2, x):
    ...     ...
    Traceback (most recent call last):
    SyntaxError: positional patterns follow keyword patterns

>>> match ...:
    ...   case Foo(a, z=1, y=2, x):
    ...     ...
    Traceback (most recent call last):
    SyntaxError: positional patterns follow keyword patterns

>>> match ...:
    ...   case Foo(z=1, x, y=2):
    ...     ...
    Traceback (most recent call last):
    SyntaxError: positional patterns follow keyword patterns

>>> match ...:
    ...   case C(a=b, c, d=e, f, g=h, i, j=k, ...):
    ...     ...
    Traceback (most recent call last):
    SyntaxError: positional patterns follow keyword patterns
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