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Printing in Edebug (GNU Emacs Lisp Reference Manual)

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If an expression in your program produces a value containing circular list structure, you may get an error when Edebug attempts to print it.

One way to cope with circular structure is to set print-length or print-level to truncate the printing. Edebug does this for you; it binds print-length and print-level to the values of the variables edebug-print-length and edebug-print-level (so long as they have non-nil values). See Variables Affecting Output.

User Option: edebug-print-length ¶

If non-nil, Edebug binds print-length to this value while printing results. The default value is 50.

User Option: edebug-print-level ¶

If non-nil, Edebug binds print-level to this value while printing results. The default value is 50.

You can also print circular structures and structures that share elements more informatively by binding print-circle to a non-nil value.

Here is an example of code that creates a circular structure:

(setq a (list 'x 'y))
(setcar a a)

If print-circle is non-nil, printing functions (e.g., prin1) will print a as ‘#1=(#1# y)’. The ‘#1=’ notation labels the structure that follows it with the label ‘1’, and the ‘#1#’ notation references the previously labeled structure. This notation is used for any shared elements of lists or vectors.

User Option: edebug-print-circle ¶

If non-nil, Edebug binds print-circle to this value while printing results. The default value is t.

For further details about how printing can be customized, see see Output Functions.

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