Comments on: Analyzing return values with a recursive macro

By: Aaron Feng

Aaron Feng — Tue, 22 Apr 2008 17:23:55 +0000

This is great! I’m tired of using format function for debugging.

By: Robert Goldman

Robert Goldman — Sun, 13 Apr 2008 15:26:46 +0000

One useful extension would be to augment the walker to handle forms that return multiple values….

By: Leslie

Leslie — Sat, 12 Apr 2008 20:30:31 +0000

This is only a first stab, though. Problems will arise when macros are in the inspected body, and possibly also when special operators are involved.

By: Brian

Brian — Sat, 12 Apr 2008 20:05:49 +0000

Sometimes I wonder why I bother continuing to try to learn Lisp, then I read stuff like this. This is really cool.

By: Leslie

Leslie — Sat, 12 Apr 2008 17:37:10 +0000

TRACE only works for a specific function.

However, WALK could actually be designed to make use of trace.

By: Sohail

Sohail — Sat, 12 Apr 2008 17:14:05 +0000

Hey,

Whats wrong with trace? Admittedly, I *hate* debugging so I try and write code that doesn’t require it, but:

(defun foo (x)
(if (eql x 0) ‘done
(list x (foo (1- x)))))

(trace foo)

(foo 5)
0: (FOO 5)
1: (FOO 4)
2: (FOO 3)
3: (FOO 2)
4: (FOO 1)
5: (FOO 0)
5: FOO returned DONE
4: FOO returned (1 DONE)
3: FOO returned (2 (1 DONE))
2: FOO returned (3 (2 (1 DONE)))
1: FOO returned (4 (3 (2 (1 DONE))))
0: FOO returned (5 (4 (3 (2 (1 DONE)))))