This chapter details Scheme 48's command processor, which incorporates
both a read-eval-print loop and an interactive debugger.
> prompt, you can type either a Scheme form
(expression or definition) or a command beginning with a comma.
the prompt changes to
: and commands
no longer need to be preceded by a comma; input beginning with
a letter or digit is assumed to be a command, not an expression.
In inspection mode the command processor prints out a
menu of selectable components for the current object of interest.
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