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Support next(iterator, default) #159483

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Empty file removed test/dynamo_expected_failures/CPython313-test_userlist-UserListTest.test_exhausted_iterator
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8 changes: 7 additions & 1 deletion torch/_dynamo/variables/builtin.py
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Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,7 @@
from ..exc import (
AttributeMutationError,
ObservedAttributeError,
ObservedUserStopIteration,
raise_observed_exception,
unimplemented_v2,
Unsupported,
Expand Down Expand Up @@ -2140,9 +2141,14 @@ def call_issubclass(self, tx: "InstructionTranslator", left_ty, right_ty):
def call_super(self, tx: "InstructionTranslator", a, b):
return variables.SuperVariable(a, b)

def call_next(self, tx: "InstructionTranslator", arg: VariableTracker):
def call_next(self, tx: "InstructionTranslator", *args):
arg = args[0]
try:
return arg.next_variable(tx)
except ObservedUserStopIteration:
if len(args) == 2:
return args[1]
raise
except Unsupported as ex:
if isinstance(arg, variables.BaseListVariable):
ex.remove_from_stats()
Expand Down
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