Syntax: #*<<bits>>
A simple bit vector is constructed containing the indicated bits
(0’s and 1’s), where the leftmost bit has index zero
and the subsequent bits have increasing indices.
Syntax: #<<n>>*<<bits>>
With an argument n, the vector to be created is of length n. If the number of bits is less than n but greater than zero, the last bit is used to fill all remaining bits of the bit vector.
The notations #* and #0* each denote an empty bit vector.
Regardless of whether the optional numeric argument n is provided,
the token that follows the asterisk is delimited by
a normal token delimiter.
However, (unless the value of *read-suppress* is true)
an error of type reader-error is signaled
if that token is not composed entirely of 0’s and 1’s,
or if n was supplied
and the token is composed of more than n bits,
or if n is greater than one, but no bits were specified.
Neither a single escape nor a multiple escape is permitted in this token.
For information on how the Lisp printer prints bit vectors, see Printing Bit Vectors.