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| ANSI Common Lisp 6 Iteration 6.1 The LOOP Facility ### 6.1.5 Unconditional Execution Clauses The `do` and `doing` constructs evaluate the supplied forms wherever they occur in the expanded form of loop. The form argument can be any compound form. Each form is evaluated in every iteration. Because every loop clause must begin with a loop keyword, the keyword `do` is used when no control action other than execution is required. The `return` construct takes one form. Any values returned by the form are immediately returned by the loop form. It is equivalent to the clause `do (return-from block-name value)`, where block-name is the name specified in a `named` clause, or nil if there is no `named` clause. 6.1.5.1 Examples of unconditional execution

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