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Starts evaluating the form in the single-step mode. In this mode, before any form is evaluated, the Stepper will print the form and prompt the user for a Stepper command. The Stepper binds the two variables print-level and print-length both to
2
, so that the current form may not occupy too much space on the screen. A Stepper command will be executed when the user types the single character for the command followed by the required arguments, if any, and presses the newline key. If the user presses the newline key without having typed any character, then the Stepper will assume that the Stepper commandn
was abbreviated.
The stepper commands are:
Newline
*
. The main
purpose of this command is to allow the current form to be examined further by
accessing *
.
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