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Fix return type of next when default parameter is provided. - #827
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**test_next.py**: ```python z = (x*2 for x in range(10)) reveal_type(next(z, None)) ``` Before: ```shell test_next.py:2: error: Revealed type is 'builtins.int*' ``` After: ```shell test_next.py:2: error: Revealed type is 'Union[builtins.int*, builtins.None]' ```
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test_next.py:
Before:
After: