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bug#52479: 27.2; EDebugging stops when breakpoint condition can not be p
From: |
Петров Андрей |
Subject: |
bug#52479: 27.2; EDebugging stops when breakpoint condition can not be printed |
Date: |
Tue, 14 Dec 2021 13:03:51 +0000 |
Hello, team!
The following code can reproduce the bug:
(require 'cl-lib)
(require 'eieio)
(defclass my-field ()
((from-types :initform nil)
(type :initform nil)))
(defun test ()
"Demonstrates edebug condition printing bug.
1. evaluate the buffer
2. instrument `test' function for debugging
3. add conditional breakpoint inside lambda below (see comment)
M-x edebug-set-conditional-breakpoint [RET] root [RET]
4. Start the function for debugging
M-x (test)
5. Continue to the breakpoint
c
Now error: \"Apparently circular structure being printed\" is
printed and no further debugging is possible.
"
(let* ((root (my-field))
(tmp root))
(dotimes (i 100)
(let ((a (my-field)))
(push a (oref tmp type))
(push tmp (oref a from-types))
(setf tmp a)))
(push root (oref tmp type))
(cl-remove root '(1 2 3 4) :test (lambda (a b) ;; <-- put cursor here and
set
;; conditional breakpoint with
condition: root
(= (length (oref a from-types))) b))
(cl-remove root '(1 2 3 4) :test (lambda (a b) (= (length (oref a
from-types))) b))
(cl-remove root '(1 2 3 4) :test (lambda (a b) (= (length (oref a
from-types))) b))
"Finished"
))
It hard for me to get backtraces on the example but on other
(complicated) code I got the following using recursive edit:
Debugger entered--Lisp error: (error "Apparently circular structure being
printed")
apply(debug error (error "Apparently circular structure being printed"))
edebug(error (error "Apparently circular structure being printed"))
signal(error ("Apparently circular structure being printed"))
edebug-signal(error ("Apparently circular structure being printed"))
message("Break: %s => %s" filtered (#<field field-157aa078be4c>))
edebug--display-1(nil 0 before)
edebug--display(nil 0 before)
edebug-debugger(0 before nil)
edebug-before(0)
(edebug-after (edebug-before 0) 11 (find-inpas-paths (edebug-after 0 1
parent) (edebug-after 0 2 stop-id) (edebug-after (edebug-before 3) 10 (if
(edebug-after 0 4 filtered) (edebug-after (edebug-before 5) 8 (cl-remove
(edebug-after 0 6 parent) (edebug-after 0 7 context) :count 1 :test (lambda (a
b) (edebug-enter ... ... ...)))) (edebug-after 0 9 context)))))
(lambda nil (edebug-after (edebug-before 0) 11 (find-inpas-paths
(edebug-after 0 1 parent) (edebug-after 0 2 stop-id) (edebug-after
(edebug-before 3) 10 (if (edebug-after 0 4 filtered) (edebug-after
(edebug-before 5) 8 (cl-remove (edebug-after 0 6 parent) (edebug-after 0 7
context) :count 1 :test (lambda ... ...))) (edebug-after 0 9 context))))))()
edebug-default-enter(edebug-anon17 (#<field field-157aa078be4c>) (lambda nil
(edebug-after (edebug-before 0) 11 (find-inpas-paths (edebug-after 0 1 parent)
(edebug-after 0 2 stop-id) (edebug-after (edebug-before 3) 10 (if (edebug-after
0 4 filtered) (edebug-after (edebug-before 5) 8 (cl-remove ... ... :count 1
:test ...)) (edebug-after 0 9 context)))))))
edebug-enter(edebug-anon17 (#<field field-157aa078be4c>) (lambda nil
(edebug-after (edebug-before 0) 11 (find-inpas-paths (edebug-after 0 1 parent)
(edebug-after 0 2 stop-id) (edebug-after (edebug-before 3) 10 (if (edebug-after
0 4 filtered) (edebug-after (edebug-before 5) 8 (cl-remove ... ... :count 1
:test ...)) (edebug-after 0 9 context)))))))
(lambda (parent) (edebug-enter 'edebug-anon17 (list parent) #'(lambda nil
(edebug-after (edebug-before 0) 11 (find-inpas-paths (edebug-after 0 1 parent)
(edebug-after 0 2 stop-id) (edebug-after ... 10 ...))))))(#<field
field-157aa078be4c>)
mapcan((lambda (parent) (edebug-enter 'edebug-anon17 (list parent) #'(lambda
nil (edebug-after (edebug-before 0) 11 (find-inpas-paths (edebug-after 0 1
parent) (edebug-after 0 2 stop-id) (edebug-after ... 10 ...)))))) (#<field
field-157aa078be4c>))
P.S. I could not copy the text from emacs with C-c M-i according to hint:
While in the mail buffer:
Type C-c C-c to send the bug report.
Type C-x k RET to cancel (don’t send it).
Type C-c M-i to copy text to your preferred mail program. <----
Andrey Petrov.
- bug#52479: 27.2; EDebugging stops when breakpoint condition can not be printed,
Петров Андрей <=