Concatenation of array and range

[Samuel Redding]

Hello there,

is it possible to concat an array and a range? In Python one 
would have
"""
list1 = [1, 2, 3]
list1 += array.array('L', range(a, b))
"""

The equivalent in D should be something like
"""
ulong[] list1 = [1, 2, 3];
list1 ~= iota(a, b);
"""

I haven't found a way to do this. The only way to do it seems to 
extend "list1" and then iterate over the range and insert the 
elements.