Extends the standard concatenate function allowing it to take any Common Lisp type.
concatenate
common-lisp
concatenate result-type &rest sequences => result-sequence
result-type
A type specifier.
sequences
A sequence.
result-sequence
The function concatenate has been extended to take any Common Lisp type. The result-sequence will be of type result-type unless this is not possible, in which case a type-error is signaled.
type-error
coerce
LispWorks User Guide and Reference Manual - 13 Feb 2015