new test cases for unpacking tuples/lists/iterables with fused type input

tests/run/unpack_fused.pyx

+
+ctypedef fused sequence:
+    list
+    tuple
+    object
+
+def unpack_one(sequence it):
+    """
+    >>> items = [1]
+    >>> unpack_one(items)
+    1
+    >>> unpack_one(iter(items))
+    1
+    >>> unpack_one(list(items))
+    1
+    >>> unpack_one(tuple(items))
+    1
+    """
+    a, = it
+    return a
+
+def unpack_two(sequence it):
+    """
+    >>> items = [1,2]
+    >>> unpack_two(items)
+    (1, 2)
+    >>> unpack_two(iter(items))
+    (1, 2)
+    >>> unpack_two(list(items))
+    (1, 2)
+    >>> unpack_two(tuple(items))
+    (1, 2)
+    """
+    a,b = it
+    return a,b
+
+def unpack_two_int(sequence it):
+    """
+    >>> items = [1,2]
+    >>> unpack_two_int(items)
+    (1, 2)
+    >>> unpack_two_int(iter(items))
+    (1, 2)
+    >>> unpack_two_int(list(items))
+    (1, 2)
+    >>> unpack_two_int(tuple(items))
+    (1, 2)
+
+    >>> items = [1, object()]
+    >>> unpack_two_int(items)
+    Traceback (most recent call last):
+    TypeError: an integer is required
+    >>> unpack_two_int(iter(items))
+    Traceback (most recent call last):
+    TypeError: an integer is required
+    >>> unpack_two_int(list(items))
+    Traceback (most recent call last):
+    TypeError: an integer is required
+    >>> unpack_two_int(tuple(items))
+    Traceback (most recent call last):
+    TypeError: an integer is required
+    """
+    cdef int b
+    a,b = it
+    return a,b
+
+def unpack_many(sequence it):
+    """
+    >>> items = range(1,13)
+    >>> unpack_many(items)
+    (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
+    >>> unpack_many(iter(items))
+    (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
+    >>> unpack_many(list(items))
+    (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
+    >>> unpack_many(tuple(items))
+    (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
+    """
+    a,b,c,d,e,f,g,h,i,j,k,l = it
+    return a,b,c,d,e,f,g,h,i,j,k,l
+
+def unpack_many_int(sequence it):
+    """
+    >>> items = range(1,13)
+    >>> unpack_many_int(items)
+    (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
+    >>> unpack_many_int(iter(items))
+    (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
+    >>> unpack_many_int(list(items))
+    (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
+    >>> unpack_many_int(tuple(items))
+    (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
+
+    >>> items = range(1,10)
+    >>> unpack_many_int(items)
+    Traceback (most recent call last):
+    ValueError: need more than 9 values to unpack
+    >>> unpack_many_int(iter(items))
+    Traceback (most recent call last):
+    ValueError: need more than 9 values to unpack
+    >>> unpack_many_int(list(items))
+    Traceback (most recent call last):
+    ValueError: need more than 9 values to unpack
+    >>> unpack_many_int(tuple(items))
+    Traceback (most recent call last):
+    ValueError: need more than 9 values to unpack
+    """
+    cdef int b
+    cdef long f
+    cdef Py_ssize_t h
+    a,b,c,d,e,f,g,h,i,j,k,l = it
+    return a,b,c,d,e,f,g,h,i,j,k,l