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1.3.2 Compiler-only Implementation

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.