#v = [null=junk]  # error: unexpected value for attribute null: junk
#v = [null] junk  # error: empty null value expected instead of 'junk'

print $v0 # Undefined.

v1 = [null]
print $v1

v2 = x
v2 = [null]
print $v2

v3a = [null]
v3b = $v3a
print $v3b
v3b = ($v3a)
print $v3b
print ($v3b)

print [null]

./: