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bpo-43224: Draft implementation of PEP 646 #30398

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bpo-43224: Draft implementation of PEP 646 #30398

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64abc0a
PEP 646: Grammar and compiler changes
mrahtz Dec 3, 2021
b725671
PEP 646: Add tests for syntax changes
mrahtz Jan 3, 2022
ea329b9
PEP 646: Add AST tests for *args annotations
mrahtz Dec 7, 2021
681dc4e
PEP 646: Add AST tests for return types with unpacking
mrahtz Dec 7, 2021
69f575f
PEP 646: Add AST tests for variable annotations with unpacking
mrahtz Dec 7, 2021
095a620
PEP 646: Add support for starring tuple types
mrahtz Jan 2, 2022
6713748
PEP 646: Add tests for starring tuple types
mrahtz Jan 2, 2022
038b8f0
PEP 646: Implement support in typing.py
mrahtz Jan 2, 2022
f028339
PEP 646: Add tests for everything in typing.py
mrahtz Jan 2, 2022
38c17d3
PEP 646: Add tests for typing.get_{origin,args}
mrahtz Jan 4, 2022
9991937
PEP 646: Various fixes to genericaliasobject.c
mrahtz Jan 15, 2022
9017d22
PEP 646: Fix test_pep646_syntax import
mrahtz Jan 15, 2022
07ed599
PEP 646: Add docstring for TypeVarTuple
mrahtz Jan 17, 2022
74e5252
PEP 646: Swap a Py_INCREF with a Py_NewRef
mrahtz Jan 20, 2022
6cb3aa5
PEP 646: Add test for assigning to a slice containing a star
mrahtz Jan 20, 2022
daef59b
📜🤖 Added by blurb_it.
blurb-it[bot] Jan 20, 2022
3c2a7e7
PEP 646: Add line to Doc/whatsnew
mrahtz Jan 20, 2022
456156a
PEP 646: Use stdbool.h; separate test cases
mrahtz Jan 25, 2022
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3 changes: 3 additions & 0 deletions Doc/whatsnew/3.11.rst
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Expand Up @@ -68,6 +68,9 @@ Summary -- Release highlights
PEP-654: Exception Groups and ``except*``.
(Contributed by Irit Katriel in :issue:`45292`.)

PEP 646: Variadic Generics.
(Contributed by Matthew Rahtz in :issue:`43224`.)

New Features
============

Expand Down
9 changes: 8 additions & 1 deletion Grammar/python.gram
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Expand Up @@ -308,6 +308,8 @@ slash_with_default[SlashWithDefault*]:
star_etc[StarEtc*]:
| '*' a=param_no_default b=param_maybe_default* c=[kwds] {
_PyPegen_star_etc(p, a, b, c) }
| '*' a=param_no_default_star_annotation b=param_maybe_default* c=[kwds] {
_PyPegen_star_etc(p, a, b, c) }
| '*' ',' b=param_maybe_default+ c=[kwds] {
_PyPegen_star_etc(p, NULL, b, c) }
| a=kwds { _PyPegen_star_etc(p, NULL, NULL, a) }
Expand All @@ -331,14 +333,19 @@ kwds[arg_ty]: '**' a=param_no_default { a }
param_no_default[arg_ty]:
| a=param ',' tc=TYPE_COMMENT? { _PyPegen_add_type_comment_to_arg(p, a, tc) }
| a=param tc=TYPE_COMMENT? &')' { _PyPegen_add_type_comment_to_arg(p, a, tc) }
param_no_default_star_annotation[arg_ty]:
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Why not join these to param_no_default? That way we can remove the extra rule in star_etc.

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Hmm, wouldn't that mess with other things that use param_no_default though? E.g. kwds uses param_no_default, so if we joined these to param_no_default, wouldn't we accidentally allow def foo(***args)?

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Friendly poke :)

| a=param_star_annotation ',' tc=TYPE_COMMENT? { _PyPegen_add_type_comment_to_arg(p, a, tc) }
| a=param_star_annotation tc=TYPE_COMMENT? &')' { _PyPegen_add_type_comment_to_arg(p, a, tc) }
param_with_default[NameDefaultPair*]:
| a=param c=default ',' tc=TYPE_COMMENT? { _PyPegen_name_default_pair(p, a, c, tc) }
| a=param c=default tc=TYPE_COMMENT? &')' { _PyPegen_name_default_pair(p, a, c, tc) }
param_maybe_default[NameDefaultPair*]:
| a=param c=default? ',' tc=TYPE_COMMENT? { _PyPegen_name_default_pair(p, a, c, tc) }
| a=param c=default? tc=TYPE_COMMENT? &')' { _PyPegen_name_default_pair(p, a, c, tc) }
param[arg_ty]: a=NAME b=annotation? { _PyAST_arg(a->v.Name.id, b, NULL, EXTRA) }
param_star_annotation[arg_ty]: a=NAME b=star_annotation { _PyAST_arg(a->v.Name.id, b, NULL, EXTRA) }
annotation[expr_ty]: ':' a=expression { a }
star_annotation[expr_ty]: ':' a=star_expression { a }
default[expr_ty]: '=' a=expression { a }

# If statement
Expand Down Expand Up @@ -780,7 +787,7 @@ primary[expr_ty]:

slices[expr_ty]:
| a=slice !',' { a }
| a[asdl_expr_seq*]=','.slice+ [','] { _PyAST_Tuple(a, Load, EXTRA) }
| a[asdl_expr_seq*]=','.(slice | starred_expression)+ [','] { _PyAST_Tuple(a, Load, EXTRA) }
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I would prefer to move starred_expression as another option of slice as we already have named_expression there

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I just tried this, but then I get SyntaxError: can't use starred expression here for e.g. a[*b].

I think what happens is, if we move starred_expression to slice (as | a=starred_expression { a }), then when we do a[*b], it triggers the first option of slices, where the starred_expression doesn't get processed by _PyAST_Tuple.

I can't see any way to make sure _PyAST_Tuple definitely gets called for starred_expression without doing something to slices, so I think the original attempt with (slice | starred_expression) is cleanest. Wdyt?


slice[expr_ty]:
| a=[expression] ':' b=[expression] c=[':' d=[expression] { d }] { _PyAST_Slice(a, b, c, EXTRA) }
Expand Down
25 changes: 24 additions & 1 deletion Lib/test/test_ast.py
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Expand Up @@ -13,7 +13,7 @@
from test import support

def to_tuple(t):
if t is None or isinstance(t, (str, int, complex)):
if t is None or isinstance(t, (str, int, complex)) or t is Ellipsis:
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return t
elif isinstance(t, list):
return [to_tuple(e) for e in t]
Expand Down Expand Up @@ -46,10 +46,20 @@ def to_tuple(t):
"def f(a=0): pass",
# FunctionDef with varargs
"def f(*args): pass",
# FunctionDef with varargs as TypeVarTuple
"def f(*args: *Ts): pass",
# FunctionDef with varargs as unpacked Tuple
"def f(*args: *tuple[int, ...]): pass",
# FunctionDef with varargs as unpacked Tuple *and* TypeVarTuple
"def f(*args: *tuple[int, *Ts]): pass",
# FunctionDef with kwargs
"def f(**kwargs): pass",
# FunctionDef with all kind of args and docstring
"def f(a, b=1, c=None, d=[], e={}, *args, f=42, **kwargs): 'doc for f()'",
# FunctionDef with type annotation on return involving unpacking
"def f() -> tuple[*Ts]: pass",
"def f() -> tuple[int, *Ts]: pass",
"def f() -> tuple[int, *tuple[int, ...]]: pass",
# ClassDef
"class C:pass",
# ClassDef with docstring
Expand All @@ -65,6 +75,10 @@ def to_tuple(t):
"a,b = c",
"(a,b) = c",
"[a,b] = c",
# AnnAssign with unpacked types
"x: tuple[*Ts]",
"x: tuple[int, *Ts]",
"x: tuple[int, *tuple[str, ...]]",
# AugAssign
"v += 1",
# For
Expand Down Expand Up @@ -2316,8 +2330,14 @@ def main():
('Module', [('FunctionDef', (1, 0, 1, 14), 'f', ('arguments', [], [('arg', (1, 6, 1, 7), 'a', None, None)], None, [], [], None, []), [('Pass', (1, 10, 1, 14))], [], None, None)], []),
('Module', [('FunctionDef', (1, 0, 1, 16), 'f', ('arguments', [], [('arg', (1, 6, 1, 7), 'a', None, None)], None, [], [], None, [('Constant', (1, 8, 1, 9), 0, None)]), [('Pass', (1, 12, 1, 16))], [], None, None)], []),
('Module', [('FunctionDef', (1, 0, 1, 18), 'f', ('arguments', [], [], ('arg', (1, 7, 1, 11), 'args', None, None), [], [], None, []), [('Pass', (1, 14, 1, 18))], [], None, None)], []),
('Module', [('FunctionDef', (1, 0, 1, 23), 'f', ('arguments', [], [], ('arg', (1, 7, 1, 16), 'args', ('Starred', (1, 13, 1, 16), ('Name', (1, 14, 1, 16), 'Ts', ('Load',)), ('Load',)), None), [], [], None, []), [('Pass', (1, 19, 1, 23))], [], None, None)], []),
('Module', [('FunctionDef', (1, 0, 1, 36), 'f', ('arguments', [], [], ('arg', (1, 7, 1, 29), 'args', ('Starred', (1, 13, 1, 29), ('Subscript', (1, 14, 1, 29), ('Name', (1, 14, 1, 19), 'tuple', ('Load',)), ('Tuple', (1, 20, 1, 28), [('Name', (1, 20, 1, 23), 'int', ('Load',)), ('Constant', (1, 25, 1, 28), Ellipsis, None)], ('Load',)), ('Load',)), ('Load',)), None), [], [], None, []), [('Pass', (1, 32, 1, 36))], [], None, None)], []),
('Module', [('FunctionDef', (1, 0, 1, 36), 'f', ('arguments', [], [], ('arg', (1, 7, 1, 29), 'args', ('Starred', (1, 13, 1, 29), ('Subscript', (1, 14, 1, 29), ('Name', (1, 14, 1, 19), 'tuple', ('Load',)), ('Tuple', (1, 20, 1, 28), [('Name', (1, 20, 1, 23), 'int', ('Load',)), ('Starred', (1, 25, 1, 28), ('Name', (1, 26, 1, 28), 'Ts', ('Load',)), ('Load',))], ('Load',)), ('Load',)), ('Load',)), None), [], [], None, []), [('Pass', (1, 32, 1, 36))], [], None, None)], []),
('Module', [('FunctionDef', (1, 0, 1, 21), 'f', ('arguments', [], [], None, [], [], ('arg', (1, 8, 1, 14), 'kwargs', None, None), []), [('Pass', (1, 17, 1, 21))], [], None, None)], []),
('Module', [('FunctionDef', (1, 0, 1, 71), 'f', ('arguments', [], [('arg', (1, 6, 1, 7), 'a', None, None), ('arg', (1, 9, 1, 10), 'b', None, None), ('arg', (1, 14, 1, 15), 'c', None, None), ('arg', (1, 22, 1, 23), 'd', None, None), ('arg', (1, 28, 1, 29), 'e', None, None)], ('arg', (1, 35, 1, 39), 'args', None, None), [('arg', (1, 41, 1, 42), 'f', None, None)], [('Constant', (1, 43, 1, 45), 42, None)], ('arg', (1, 49, 1, 55), 'kwargs', None, None), [('Constant', (1, 11, 1, 12), 1, None), ('Constant', (1, 16, 1, 20), None, None), ('List', (1, 24, 1, 26), [], ('Load',)), ('Dict', (1, 30, 1, 32), [], [])]), [('Expr', (1, 58, 1, 71), ('Constant', (1, 58, 1, 71), 'doc for f()', None))], [], None, None)], []),
('Module', [('FunctionDef', (1, 0, 1, 27), 'f', ('arguments', [], [], None, [], [], None, []), [('Pass', (1, 23, 1, 27))], [], ('Subscript', (1, 11, 1, 21), ('Name', (1, 11, 1, 16), 'tuple', ('Load',)), ('Tuple', (1, 17, 1, 20), [('Starred', (1, 17, 1, 20), ('Name', (1, 18, 1, 20), 'Ts', ('Load',)), ('Load',))], ('Load',)), ('Load',)), None)], []),
('Module', [('FunctionDef', (1, 0, 1, 32), 'f', ('arguments', [], [], None, [], [], None, []), [('Pass', (1, 28, 1, 32))], [], ('Subscript', (1, 11, 1, 26), ('Name', (1, 11, 1, 16), 'tuple', ('Load',)), ('Tuple', (1, 17, 1, 25), [('Name', (1, 17, 1, 20), 'int', ('Load',)), ('Starred', (1, 22, 1, 25), ('Name', (1, 23, 1, 25), 'Ts', ('Load',)), ('Load',))], ('Load',)), ('Load',)), None)], []),
('Module', [('FunctionDef', (1, 0, 1, 45), 'f', ('arguments', [], [], None, [], [], None, []), [('Pass', (1, 41, 1, 45))], [], ('Subscript', (1, 11, 1, 39), ('Name', (1, 11, 1, 16), 'tuple', ('Load',)), ('Tuple', (1, 17, 1, 38), [('Name', (1, 17, 1, 20), 'int', ('Load',)), ('Starred', (1, 22, 1, 38), ('Subscript', (1, 23, 1, 38), ('Name', (1, 23, 1, 28), 'tuple', ('Load',)), ('Tuple', (1, 29, 1, 37), [('Name', (1, 29, 1, 32), 'int', ('Load',)), ('Constant', (1, 34, 1, 37), Ellipsis, None)], ('Load',)), ('Load',)), ('Load',))], ('Load',)), ('Load',)), None)], []),
('Module', [('ClassDef', (1, 0, 1, 12), 'C', [], [], [('Pass', (1, 8, 1, 12))], [])], []),
('Module', [('ClassDef', (1, 0, 1, 32), 'C', [], [], [('Expr', (1, 9, 1, 32), ('Constant', (1, 9, 1, 32), 'docstring for class C', None))], [])], []),
('Module', [('ClassDef', (1, 0, 1, 21), 'C', [('Name', (1, 8, 1, 14), 'object', ('Load',))], [], [('Pass', (1, 17, 1, 21))], [])], []),
Expand All @@ -2327,6 +2347,9 @@ def main():
('Module', [('Assign', (1, 0, 1, 7), [('Tuple', (1, 0, 1, 3), [('Name', (1, 0, 1, 1), 'a', ('Store',)), ('Name', (1, 2, 1, 3), 'b', ('Store',))], ('Store',))], ('Name', (1, 6, 1, 7), 'c', ('Load',)), None)], []),
('Module', [('Assign', (1, 0, 1, 9), [('Tuple', (1, 0, 1, 5), [('Name', (1, 1, 1, 2), 'a', ('Store',)), ('Name', (1, 3, 1, 4), 'b', ('Store',))], ('Store',))], ('Name', (1, 8, 1, 9), 'c', ('Load',)), None)], []),
('Module', [('Assign', (1, 0, 1, 9), [('List', (1, 0, 1, 5), [('Name', (1, 1, 1, 2), 'a', ('Store',)), ('Name', (1, 3, 1, 4), 'b', ('Store',))], ('Store',))], ('Name', (1, 8, 1, 9), 'c', ('Load',)), None)], []),
('Module', [('AnnAssign', (1, 0, 1, 13), ('Name', (1, 0, 1, 1), 'x', ('Store',)), ('Subscript', (1, 3, 1, 13), ('Name', (1, 3, 1, 8), 'tuple', ('Load',)), ('Tuple', (1, 9, 1, 12), [('Starred', (1, 9, 1, 12), ('Name', (1, 10, 1, 12), 'Ts', ('Load',)), ('Load',))], ('Load',)), ('Load',)), None, 1)], []),
('Module', [('AnnAssign', (1, 0, 1, 18), ('Name', (1, 0, 1, 1), 'x', ('Store',)), ('Subscript', (1, 3, 1, 18), ('Name', (1, 3, 1, 8), 'tuple', ('Load',)), ('Tuple', (1, 9, 1, 17), [('Name', (1, 9, 1, 12), 'int', ('Load',)), ('Starred', (1, 14, 1, 17), ('Name', (1, 15, 1, 17), 'Ts', ('Load',)), ('Load',))], ('Load',)), ('Load',)), None, 1)], []),
('Module', [('AnnAssign', (1, 0, 1, 31), ('Name', (1, 0, 1, 1), 'x', ('Store',)), ('Subscript', (1, 3, 1, 31), ('Name', (1, 3, 1, 8), 'tuple', ('Load',)), ('Tuple', (1, 9, 1, 30), [('Name', (1, 9, 1, 12), 'int', ('Load',)), ('Starred', (1, 14, 1, 30), ('Subscript', (1, 15, 1, 30), ('Name', (1, 15, 1, 20), 'tuple', ('Load',)), ('Tuple', (1, 21, 1, 29), [('Name', (1, 21, 1, 24), 'str', ('Load',)), ('Constant', (1, 26, 1, 29), Ellipsis, None)], ('Load',)), ('Load',)), ('Load',))], ('Load',)), ('Load',)), None, 1)], []),
('Module', [('AugAssign', (1, 0, 1, 6), ('Name', (1, 0, 1, 1), 'v', ('Store',)), ('Add',), ('Constant', (1, 5, 1, 6), 1, None))], []),
('Module', [('For', (1, 0, 1, 15), ('Name', (1, 4, 1, 5), 'v', ('Store',)), ('Name', (1, 9, 1, 10), 'v', ('Load',)), [('Pass', (1, 11, 1, 15))], [], None)], []),
('Module', [('While', (1, 0, 1, 12), ('Name', (1, 6, 1, 7), 'v', ('Load',)), [('Pass', (1, 8, 1, 12))], [])], []),
Expand Down
65 changes: 62 additions & 3 deletions Lib/test/test_genericalias.py
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Expand Up @@ -41,11 +41,13 @@
from queue import Queue, SimpleQueue
from weakref import WeakSet, ReferenceType, ref
import typing
from typing import Callable, Dict, List

from typing import TypeVar
from typing import TypeVar, TypeVarTuple
T = TypeVar('T')
K = TypeVar('K')
V = TypeVar('V')
Ts = TypeVarTuple('Ts')

class BaseTest(unittest.TestCase):
"""Test basics."""
Expand Down Expand Up @@ -162,6 +164,10 @@ class MyList(list):
self.assertEqual(repr(list[str]), 'list[str]')
self.assertEqual(repr(list[()]), 'list[()]')
self.assertEqual(repr(tuple[int, ...]), 'tuple[int, ...]')
self.assertEqual(repr(tuple[*Ts]), 'tuple[*Ts]')
self.assertEqual(repr(tuple[*tuple[int]]), 'tuple[*tuple[int]]')
self.assertEqual(repr(tuple[*tuple[int, str]]), 'tuple[*tuple[int, str]]')
self.assertEqual(repr(tuple[*tuple[int, ...]]), 'tuple[*tuple[int, ...]]')
self.assertTrue(repr(MyList[int]).endswith('.BaseTest.test_repr.<locals>.MyList[int]'))
self.assertEqual(repr(list[str]()), '[]') # instances should keep their normal repr

Expand All @@ -173,8 +179,7 @@ def test_exposed_type(self):
self.assertEqual(a.__args__, (int,))
self.assertEqual(a.__parameters__, ())

def test_parameters(self):
from typing import List, Dict, Callable
def test_dict_parameters(self):
D0 = dict[str, int]
self.assertEqual(D0.__args__, (str, int))
self.assertEqual(D0.__parameters__, ())
Expand All @@ -190,6 +195,8 @@ def test_parameters(self):
D2b = dict[T, T]
self.assertEqual(D2b.__args__, (T, T))
self.assertEqual(D2b.__parameters__, (T,))

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def test_list_parameters(self):
L0 = list[str]
self.assertEqual(L0.__args__, (str,))
self.assertEqual(L0.__parameters__, ())
Expand All @@ -212,6 +219,56 @@ def test_parameters(self):
self.assertEqual(L5.__args__, (Callable[[K, V], K],))
self.assertEqual(L5.__parameters__, (K, V))

def test_tuple_parameters(self):
with self.assertRaises(TypeError):
tuple[*list[int]]

T0 = tuple[*Ts]
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self.assertEqual(T0.__args__, (*Ts,))
self.assertEqual(T0.__parameters__, (Ts,))
T1 = tuple[*tuple[int]]
self.assertEqual(T1.__args__, (*tuple[int],))
self.assertEqual(T1.__parameters__, ())
T2 = tuple[*tuple[T]]
self.assertEqual(T2.__args__, (*tuple[T],))
self.assertEqual(T2.__parameters__, (T,))
T3 = tuple[*tuple[int]]
self.assertEqual(T3.__args__, (*tuple[int],))
self.assertEqual(T3.__parameters__, ())
T4 = tuple[*tuple[int, str]]
self.assertEqual(T4.__args__, (*tuple[int, str],))
self.assertEqual(T4.__parameters__, ())
T5 = tuple[*tuple[*Ts]]
self.assertEqual(T5.__args__, (*tuple[*Ts],))
self.assertEqual(T5.__parameters__, (Ts,))
T5_0 = T5.__args__[0]
self.assertEqual(T5_0.__args__, (*Ts,))
self.assertEqual(T5_0.__parameters__, (Ts,))
T6 = tuple[*tuple[*Ts, int]]
self.assertEqual(T6.__args__, (*tuple[*Ts, int],))
self.assertEqual(T6.__parameters__, (Ts,))
T6_0 = T6.__args__[0]
self.assertEqual(T6_0.__args__, (*Ts, int))
self.assertEqual(T6_0.__parameters__, (Ts,))
T7 = tuple[*tuple[int, *Ts]]
self.assertEqual(T7.__args__, (*tuple[int, *Ts],))
self.assertEqual(T7.__parameters__, (Ts,))
T7_0 = T7.__args__[0]
self.assertEqual(T7_0.__args__, (int, *Ts))
self.assertEqual(T7_0.__parameters__, (Ts,))
T8 = tuple[*tuple[int, *Ts, str]]
self.assertEqual(T8.__args__, (*tuple[int, *Ts, str],))
self.assertEqual(T8.__parameters__, (Ts,))
T8_0 = T8.__args__[0]
self.assertEqual(T8_0.__args__, (int, *Ts, str))
self.assertEqual(T8_0.__parameters__, (Ts,))
T9 = tuple[*tuple[T, *Ts]]
self.assertEqual(T9.__args__, (*tuple[T, *Ts],))
self.assertEqual(T9.__parameters__, (T, Ts))
T10 = tuple[*tuple[*Ts, T]]
self.assertEqual(T10.__args__, (*tuple[*Ts, T],))
self.assertEqual(T10.__parameters__, (Ts, T))

def test_parameter_chaining(self):
from typing import List, Dict, Union, Callable
self.assertEqual(list[T][int], list[int])
Expand Down Expand Up @@ -242,6 +299,8 @@ def test_parameter_chaining(self):
def test_equality(self):
self.assertEqual(list[int], list[int])
self.assertEqual(dict[str, int], dict[str, int])
self.assertEqual((*tuple[int],)[0], (*tuple[int],)[0])
self.assertEqual(tuple[*tuple[int]], tuple[*tuple[int]])
self.assertNotEqual(dict[str, int], dict[str, str])
self.assertNotEqual(list, list[int])
self.assertNotEqual(list[int], list)
Expand Down
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