## Macro: COMMON-LISP:DO
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> DO ({(Var [Init] [Step])}*) (Test Exit-Form*) Declaration* Form*
> Iteration construct. Each Var is initialized in parallel to the value of the
> specified Init form. On subsequent iterations, the Vars are assigned the
> value of the Step form (if any) in parallel. The Test is evaluated before
> each evaluation of the body Forms. When the Test is true, the Exit-Forms
> are evaluated as a PROGN, with the result being the value of the DO. A block
> named NIL is established around the entire expansion, allowing RETURN to be
> used as an alternate exit mechanism.

### Lambda list
```cl
(sb-impl::varlist sb-impl::endlist &body sb-impl::body)
```