Which of the following will match?
a = [1, 2, 3] # Yes, a => [1, 2, 3]
a = 4 # Yes, a => 4
4 = a # Yes
[a, b] = [1, 2, 3] # No
a = [[1, 2, 3]] # Yes, a => [[1, 2, 3]]
[a] = [[1, 2, 3]] # Yes, a => [1, 2, 3]
[[a]] = [[1, 2, 3]] # No