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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 50 if they were
nil. (Actually, the variables edebug-print-length and
edebug-print-level specify the values to use within Edebug.)
Voir la section Variables Affecting Output.
If non-nil, Edebug binds print-length to this value while
printing results. The default value is 50.
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 '(x y)) (setcar a a) |
Custom printing prints this as ‘Result: #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.
If non-nil, Edebug binds print-circle to this value while
printing results. The default value is t.
Other programs can also use custom printing; see ‘cust-print.el’ for details.
Ce document a été généré par Eric Reinbold le 13 Octobre 2007 en utilisant texi2html 1.78.