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SBCL is essentially a compiler-only implementation of Common Lisp.
That is, for all but a few special cases, eval creates a lambda
expression, calls compile on the lambda expression to create a
compiled function, and then calls funcall on the resulting
function object. This is explicitly allowed by the ANSI standard, but
leads to some oddities, e.g. collapsing functionp and
compiled-function-p into the same predicate.