add back 'repeat' argument to itertools.product (#1407)

Fixes a regression introduced by #1393.

Author: matthiaskramm

stdlib/2/itertools.pyi

@@ -94,40 +94,40 @@ def izip_longest(*p: Iterable[Any],
                  fillvalue: Any = ...) -> Iterator[Any]: ...
 
 @overload
-def product(iter1: Iterable[_T1]) -> Iterator[Tuple[_T1]]: ...
+def product(iter1: Iterable[_T1], *, repeat: int = ...) -> Iterator[Tuple[_T1]]: ...
 @overload
 def product(iter1: Iterable[_T1],
-            iter2: Iterable[_T2]) -> Iterator[Tuple[_T1, _T2]]: ...
+            iter2: Iterable[_T2], *, repeat: int = ...) -> Iterator[Tuple[_T1, _T2]]: ...
 @overload
 def product(iter1: Iterable[_T1],
             iter2: Iterable[_T2],
-            iter3: Iterable[_T3]) -> Iterator[Tuple[_T1, _T2, _T3]]: ...
+            iter3: Iterable[_T3], *, repeat: int = ...) -> Iterator[Tuple[_T1, _T2, _T3]]: ...
 @overload
 def product(iter1: Iterable[_T1],
             iter2: Iterable[_T2],
             iter3: Iterable[_T3],
-            iter4: Iterable[_T4]) -> Iterator[Tuple[_T1, _T2, _T3, _T4]]: ...
+            iter4: Iterable[_T4], *, repeat: int = ...) -> Iterator[Tuple[_T1, _T2, _T3, _T4]]: ...
 @overload
 def product(iter1: Iterable[_T1],
             iter2: Iterable[_T2],
             iter3: Iterable[_T3],
             iter4: Iterable[_T4],
-            iter5: Iterable[_T5]) -> Iterator[Tuple[_T1, _T2, _T3, _T4, _T5]]: ...
+            iter5: Iterable[_T5], *, repeat: int = ...) -> Iterator[Tuple[_T1, _T2, _T3, _T4, _T5]]: ...
 @overload
 def product(iter1: Iterable[_T1],
             iter2: Iterable[_T2],
             iter3: Iterable[_T3],
             iter4: Iterable[_T4],
             iter5: Iterable[_T5],
-            iter6: Iterable[_T6]) -> Iterator[Tuple[_T1, _T2, _T3, _T4, _T5, _T6]]: ...
+            iter6: Iterable[_T6], *, repeat: int = ...) -> Iterator[Tuple[_T1, _T2, _T3, _T4, _T5, _T6]]: ...
 @overload
 def product(iter1: Iterable[Any],
             iter2: Iterable[Any],
             iter3: Iterable[Any],
             iter4: Iterable[Any],
             iter5: Iterable[Any],
             iter6: Iterable[Any],
-            iter7: Iterable[Any], *iterables: Iterable) -> Iterator[Tuple]: ...
+            iter7: Iterable[Any], *iterables: Iterable, repeat: int = ...) -> Iterator[Tuple]: ...
 
 def permutations(iterable: Iterable[_T],
                  r: int = ...) -> Iterator[Sequence[_T]]: ...