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CL is a language. Not an implementation. One may need to differentiate between a language and an implementation. CL is defined so that different implementation strategies are possible.

CL itself has two different compilation interfaces COMPILE and COMPILE-FILE. A file compiler may implement a multipass strategy, where calls to later in that file provided functions are resolved.

A compiler may also provide different kinds of compilation units. IIRC CMUCL does that. See "block compilation".

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