annot 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

# But prefixes of soft keywords should
# still raise specialized errors

>>> (mat x)
Traceback (most recent call last):
SyntaxError: invalid syntax. Perhaps you forgot a comma?

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: parameter without a default follows parameter with a default

>>> def f(x, /, y=1, z):
...     pass
Traceback (most recent call last):
SyntaxError: parameter without a default follows parameter with a default

>>> 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

>>> def foo(/,a,b=,c):
...    pass
Traceback (most recent call last):
SyntaxError: at least one argument must precede /

>>> def foo(a,/,/,b,c):
...    pass
Traceback (most recent call last):
SyntaxError: / may appear only once

>>> def foo(a,/,a1,/,b,c):
...    pass
Traceback (most recent call last):
SyntaxError: / may appear only once

>>> def foo(a=1,/,/,*b,/,c):
...    pass
Traceback (most recent call last):
SyntaxError: / may appear only once

>>> def foo(a,/,a1=1,/,b,c):
...    pass
Traceback (most recent call last):
SyntaxError: / may appear only once

>>> def foo(a,*b,c,/,d,e):
...    pass
Traceback (most recent call last):
SyntaxError: / must be ahead of *

>>> def foo(a=1,*b,c=3,/,d,e):
...    pass
Traceback (most recent call last):
SyntaxError: / must be ahead of *

>>> def foo(a,*b=3,c):
...    pass
Traceback (most recent call last):
SyntaxError: var-positional argument cannot have default value

>>> def foo(a,*b: int=,c):
...    pass
Traceback (most recent call last):
SyntaxError: var-positional argument cannot have default value

>>> def foo(a,**b=3):
...    pass
Traceback (most recent call last):
SyntaxError: var-keyword argument cannot have default value

>>> def foo(a,**b: int=3):
...    pass
Traceback (most recent call last):
SyntaxError: var-keyword argument cannot have default value

>>> def foo(a,*a, b, **c, d):
...    pass
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument

>>> def foo(a,*a, b, **c, d=4):
...    pass
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument

>>> def foo(a,*a, b, **c, *d):
...    pass
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument

>>> def foo(a,*a, b, **c, **d):
...    pass
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument

>>> def foo(a=1,/,**b,/,c):
...    pass
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument

>>> def foo(*b,*d):
...    pass
Traceback (most recent call last):
SyntaxError: * argument may appear only once

>>> def foo(a,*b,c,*d,*e,c):
...    pass
Traceback (most recent call last):
SyntaxError: * argument may appear only once

>>> def foo(a,b,/,c,*b,c,*d,*e,c):
...    pass
Traceback (most recent call last):
SyntaxError: * argument may appear only once

>>> def foo(a,b,/,c,*b,c,*d,**e):
...    pass
Traceback (most recent call last):
SyntaxError: * argument may appear only once

>>> def foo(a=1,/*,b,c):
...    pass
Traceback (most recent call last):
SyntaxError: expected comma between / and *

>>> def foo(a=1,d=,c):
...    pass
Traceback (most recent call last):
SyntaxError: expected default value expression

>>> def foo(a,d=,c):
...    pass
Traceback (most recent call last):
SyntaxError: expected default value expression

>>> def foo(a,d: int=,c):
...    pass
Traceback (most recent call last):
SyntaxError: expected default value expression

>>> lambda /,a,b,c: None
Traceback (most recent call last):
SyntaxError: at least one argument must precede /

>>> lambda a,/,/,b,c: None
Traceback (most recent call last):
SyntaxError: / may appear only once

>>> lambda a,/,a1,/,b,c: None
Traceback (most recent call last):
SyntaxError: / may appear only once

>>> lambda a=1,/,/,*b,/,c: None
Traceback (most recent call last):
SyntaxError: / may appear only once

>>> lambda a,/,a1=1,/,b,c: None
Traceback (most recent call last):
SyntaxError: / may appear only once

>>> lambda a,*b,c,/,d,e: None
Traceback (most recent call last):
SyntaxError: / must be ahead of *

>>> lambda a=1,*b,c=3,/,d,e: None
Traceback (most recent call last):
SyntaxError: / must be ahead of *

>>> lambda a=1,/*,b,c: None
Traceback (most recent call last):
SyntaxError: expected comma between / and *

>>> lambda a,*b=3,c: None
Traceback (most recent call last):
SyntaxError: var-positional argument cannot have default value

>>> lambda a,**b=3: None
Traceback (most recent call last):
SyntaxError: var-keyword argument cannot have default value

>>> lambda a, *a, b, **c, d: None
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument

>>> lambda a,*a, b, **c, d=4: None
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument

>>> lambda a,*a, b, **c, *d: None
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument

>>> lambda a,*a, b, **c, **d: None
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument

>>> lambda a=1,/,**b,/,c: None
Traceback (most recent call last):
SyntaxError: arguments cannot follow var-keyword argument

>>> lambda *b,*d: None
Traceback (most recent call last):
SyntaxError: * argument may appear only once

>>> lambda a,*b,c,*d,*e,c: None
Traceback (most recent call last):
SyntaxError: * argument may appear only once

>>> lambda a,b,/,c,*b,c,*d,*e,c: None
Traceback (most recent call last):
SyntaxError: * argument may appear only once

>>> lambda a,b,/,c,*b,c,*d,**e: None
Traceback (most recent call last):
SyntaxError: * argument may appear only once

>>> lambda a=1,d=,c: None
Traceback (most recent call last):
SyntaxError: expected default value expression

>>> lambda a,d=,c: None
Traceback (most recent call last):
SyntaxError: expected default value expression

>>> lambda a,d=3,c: None
Traceback (most recent call last):
SyntaxError: parameter without a default follows parameter with a default

>>> lambda a,/,d=3,c: None
Traceback (most recent call last):
SyntaxError: parameter without a default follows parameter with a default

>>> 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__
>>> f(a=)
Traceback (most recent call last):
SyntaxError: expected argument value expression
>>> f(a, b, c=)
Traceback (most recent call last):
SyntaxError: expected argument value expression
>>> f(a, b, c=, d)
Traceback (most recent call last):
SyntaxError: expected argument value expression
>>> f(*args=[0])
Traceback (most recent call last):
SyntaxError: cannot assign to iterable argument unpacking
>>> f(a, b, *args=[0])
Traceback (most recent call last):
SyntaxError: cannot assign to iterable argument unpacking
>>> f(**kwargs={'a': 1})
Traceback (most recent call last):
SyntaxError: cannot assign to keyword argument unpacking
>>> f(a, b, *args, **kwargs={'a': 1})
Traceback (most recent call last):
SyntaxError: cannot assign to keyword argument unpacking


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 ':'

   >>> def f[T]()
   ...     pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

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

   >>> class A[T]
   ...     pass
   Traceback (most recent call last):
   SyntaxError: expected ':'

   >>> class A[T]()
   ...     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 '='?


Missing parens after function definition

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

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

Parenthesized arguments in function definitions

   >>> def f(x, (y, z), w):
   ...    pass
   Traceback (most recent call last):
   SyntaxError: Function parameters cannot be parenthesized

   >>> def f((x, y, z, w)):
   ...    pass
   Traceback (most recent call last):
   SyntaxError: Function parameters cannot be parenthesized

   >>> def f(x, (y, z, w)):
   ...    pass
   Traceback (most recent call last):
   SyntaxError: Function parameters cannot be parenthesized

   >>> def f((x, y, z), w):
   ...    pass
   Traceback (most recent call last):
   SyntaxError: Function parameters cannot be parenthesized

   >>> lambda x, (y, z), w: None
   Traceback (most recent call last):
   SyntaxError: Lambda expression parameters cannot be parenthesized

   >>> lambda (x, y, z, w): None
   Traceback (most recent call last):
   SyntaxError: Lambda expression parameters cannot be parenthesized

   >>> lambda x, (y, z, w): None
   Traceback (most recent call last):
   SyntaxError: Lambda expression parameters cannot be parenthesized

   >>> lambda (x, y, z), w: None
   Traceback (most recent call last):
   SyntaxError: Lambda expression parameters cannot be parenthesized

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

Custom error message for try block mixing except and except*

   >>> try:
   ...    pass
   ... except TypeError:
   ...    pass
   ... except* ValueError:
   ...    pass
   Traceback (most recent call last):
   SyntaxError: cannot have both 'except' and 'except*' on the same 'try'

   >>> try:
   ...    pass
   ... except* TypeError:
   ...    pass
   ... except ValueError:
   ...    pass
   Traceback (most recent call last):
   SyntaxError: cannot have both 'except' and 'except*' on the same 'try'

   >>> try:
   ...    pass
   ... except TypeError:
   ...    pass
   ... except TypeError:
   ...    pass
   ... except* ValueError:
   ...    pass
   Traceback (most recent call last):
   SyntaxError: cannot have both 'except' and 'except*' on the same 'try'

   >>> try:
   ...    pass
   ... except* TypeError:
   ...    pass
   ... except* TypeError:
   ...    pass
   ... except ValueError:
   ...    pass
   Traceback (most recent call last):
   SyntaxError: cannot have both 'except' and 'except*' on the same 'try'

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
   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

   >>> 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

   >>> def foo[T](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

   >>> class Blech[T](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


   >>> 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

Custom exception for 'except*' without an exception type

   >>> try:
   ...   pass
   ... except* A as a:
   ...   pass
   ... except*:
   ...   pass
   Traceback (most recent call last):
   SyntaxError: expected one or more exception types


>>> 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

>>> import a from b
Traceback (most recent call last):
SyntaxError: Did you mean to use 'from ... import ...' instead?

>>> import a.y.z from b.y.z
Traceback (most recent call last):
SyntaxError: Did you mean to use 'from ... import ...' instead?

>>> import a from b as bar
Traceback (most recent call last):
SyntaxError: Did you mean to use 'from ... import ...' instead?

>>> import a.y.z from b.y.z as bar
Traceback (most recent call last):
SyntaxError: Did you mean to use 'from ... import ...' instead?

>>> import a, b,c from b
Traceback (most recent call last):
SyntaxError: Did you mean to use 'from ... import ...' instead?

>>> import a.y.z, b.y.z, c.y.z from b.y.z
Traceback (most recent call last):
SyntaxError: Did you mean to use 'from ... import ...' instead?

>>> import a,b,c from b as bar
Traceback (most recent call last):
SyntaxError: Did you mean to use 'from ... import ...' instead?

>>> import a.y.z, b.y.z, c.y.z from b.y.z as bar
Traceback (most recent call last):
SyntaxError: Did you mean to use 'from ... import ...' instead?

# 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

Uses of the star operator which should fail:

A[:*b]

    >>> A[:*b]
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax
    >>> A[:(*b)]
    Traceback (most recent call last):
        ...
    SyntaxError: cannot use starred expression here
    >>> A[:*b] = 1
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax
    >>> del A[:*b]
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax

A[*b:]

    >>> A[*b:]
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax
    >>> A[(*b):]
    Traceback (most recent call last):
        ...
    SyntaxError: cannot use starred expression here
    >>> A[*b:] = 1
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax
    >>> del A[*b:]
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax

A[*b:*b]

    >>> A[*b:*b]
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax
    >>> A[(*b:*b)]
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax
    >>> A[*b:*b] = 1
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax
    >>> del A[*b:*b]
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax

A[*(1:2)]

    >>> A[*(1:2)]
    Traceback (most recent call last):
        ...
    SyntaxError: Invalid star expression
    >>> A[*(1:2)] = 1
    Traceback (most recent call last):
        ...
    SyntaxError: Invalid star expression
    >>> del A[*(1:2)]
    Traceback (most recent call last):
        ...
    SyntaxError: Invalid star expression

A[*:] and A[:*]

    >>> A[*:]
    Traceback (most recent call last):
        ...
    SyntaxError: Invalid star expression
    >>> A[:*]
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax

A[*]

    >>> A[*]
    Traceback (most recent call last):
        ...
    SyntaxError: Invalid star expression

A[**]

    >>> A[**]
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax

A[**b]

    >>> A[**b]
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax
    >>> A[**b] = 1
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax
    >>> del A[**b]
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax

def f(x: *b)

    >>> def f6(x: *b): pass
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax
    >>> def f7(x: *b = 1): pass
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax

**kwargs: *a

    >>> def f8(**kwargs: *a): pass
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax

x: *b

    >>> x: *b
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax
    >>> x: *b = 1
    Traceback (most recent call last):
        ...
    SyntaxError: invalid syntax

Invalid bytes literals:

   >>> b"Ä€"
   Traceback (most recent call last):
      ...
       b"Ä€"
        ^^^
   SyntaxError: bytes can only contain ASCII literal characters

   >>> b"абвгде"
   Traceback (most recent call last):
      ...
       b"абвгде"
        ^^^^^^^^
   SyntaxError: bytes can only contain ASCII literal characters

   >>> b"abc ъющый"  # first 3 letters are ascii
   Traceback (most recent call last):
      ...
       b"abc ъющый"
        ^^^^^^^^^^^
   SyntaxError: bytes can only contain ASCII literal characters

Invalid expressions in type scopes:

   >>> type A[T: (x:=3)] = int
   Traceback (most recent call last):
      ...
   SyntaxError: named expression cannot be used within a TypeVar bound

   >>> type A[T: (yield 3)] = int
   Traceback (most recent call last):
      ...
   SyntaxError: yield expression cannot be used within a TypeVar bound

   >>> type A[T: (await 3)] = int
   Traceback (most recent call last):
      ...
   SyntaxError: await expression cannot be used within a TypeVar bound

   >>> type A[T: (yield from [])] = int
   Traceback (most recent call last):
      ...
   SyntaxError: yield expression cannot be used within a TypeVar bound

   >>> type A = (x := 3)
   Traceback (most recent call last):
      ...
   SyntaxError: named expression cannot be used within a type alias

   >>> type A = (yield 3)
   Traceback (most recent call last):
      ...
   SyntaxError: yield expression cannot be used within a type alias

   >>> type A = (await 3)
   Traceback (most recent call last):
      ...
   SyntaxError: await expression cannot be used within a type alias

   >>> type A = (yield from [])
   Traceback (most recent call last):
      ...
   SyntaxError: yield expression cannot be used within a type alias

   >>> class A[T]((x := 3)): ...
   Traceback (most recent call last):
      ...
   SyntaxError: named expression cannot be used within the definition of a generic

   >>> class A[T]((yield 3)): ...
   Traceback (most recent call last):
      ...
   SyntaxError: yield expression cannot be used within the definition of a generic

   >>> class A[T]((await 3)): ...
   Traceback (most recent call last):
      ...
   SyntaxError: await expression cannot be used within the definition of a generic

   >>> class A[T]((yield from [])): ...
   Traceback (most recent call last):
      ...
   SyntaxError: yield expression cannot be used within the definition of a generic

    >>> f(**x, *y)
    Traceback (most recent call last):
    SyntaxError: iterable argument unpacking follows keyword argument unpacking

    >>> f(**x, *)
    Traceback (most recent call last):
    SyntaxError: Invalid star expression

    >>> f(x, *:)
    Traceback (most recent call last):
    SyntaxError: Invalid star expression

    >>> f(x, *)
    Traceback (most recent call last):
    SyntaxError: Invalid star expression

    >>> f(x = 5, *)
    Traceback (most recent call last):
    SyntaxError: Invalid star expression

    >>> f(x = 5, *:)
    Traceback (most recent call last):
    SyntaxError: Invalid star expression
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