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| Allegro CL

| 3 Evaluation and Compilation 3.1 Evaluation 3.1.2 The Evaluation Model 3.1.2.1 Form Evaluation ### 3.1.2.1.2 Conses as Forms A cons that is used as a form is called a compound form. If the car of that compound form is a symbol, that symbol is the name of an operator, and the form is either a special form, a macro form, or a function form, depending on the function binding of the operator in the current lexical environment. If the operator is neither a special operator nor a macro name, it is assumed to be a function name (even if there is no definition for such a function). If the car of the compound form is not a symbol, then that car must be a lambda expression, in which case the compound form is a lambda form. How a compound form is processed depends on whether it is classified as a special form, a macro form, a function form, or a lambda form. 3.1.2.1.2.1 Special Forms 3.1.2.1.2.2 Macro Forms 3.1.2.1.2.3 Function Forms 3.1.2.1.2.4 Lambda Forms

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