bug#29246: 26.0.90; Wrong type argument: integer-or-marker-p, nil in flymake--highlight-line

[Lele Gaifax]

I recompiled my Emacs this morning, to get advantage of the fix to issue
#29174:

In GNU Emacs 26.0.90 (build 3, x86_64-pc-linux-gnu, GTK+ Version 3.22.25)
 of 2017-11-10 built on nautilus
Repository revision: e6f1fd40916afb692bd25e845ee87e73549201f4

I got an error with the following backtrace, keeping the backspace key pressed
to delete a dozen of characters on the last line of a Python buffer:

Debugger entered--Lisp error: (wrong-type-argument integer-or-marker-p nil)
  make-overlay(nil nil)
  (and t (make-overlay (progn (or (and (memq (type-of diagnostic) 
cl-struct-flymake--diag-tags) t) (signal 'wrong-type-argument (list 
'flymake--diag diagnostic))) (aref diagnostic 2)) (progn (or (and (memq 
(type-of diagnostic) cl-struct-flymake--diag-tags) t) (signal 
'wrong-type-argument (list 'flymake--diag diagnostic))) (aref diagnostic 3))))
  (let* ((ov (and t (make-overlay (progn (or (and (memq (type-of diagnostic) 
cl-struct-flymake--diag-tags) t) (signal 'wrong-type-argument (list 
'flymake--diag diagnostic))) (aref diagnostic 2)) (progn (or (and (memq 
(type-of diagnostic) cl-struct-flymake--diag-tags) t) (signal 
'wrong-type-argument (list 'flymake--diag diagnostic))) (aref diagnostic 
3)))))) (if ov (progn (let ((alist (assoc-default (progn (or (and (memq 
(type-of diagnostic) cl-struct-flymake--diag-tags) t) (signal 
'wrong-type-argument (list 'flymake--diag diagnostic))) (aref diagnostic 4)) 
flymake-diagnostic-types-alist))) (overlay-put ov 'category (assoc-default 
'flymake-category alist)) (let* ((--cl-var-- alist) (v nil) (k nil)) (while 
(consp --cl-var--) (setq v (car --cl-var--) k (car-safe (prog1 v (setq v (cdr 
v))))) (if (eq k 'category) (progn) (overlay-put ov k v)) (setq --cl-var-- (cdr 
--cl-var--))) nil)) (let* ((--cl-default-maybe-- (function (lambda (prop value) 
(if (or (plist-member (overlay-properties ov) prop) (let ((cat (overlay-get ov 
'flymake-category))) (and cat (plist-member (symbol-plist cat) prop)))) nil 
(overlay-put ov prop value)))))) (progn (funcall --cl-default-maybe-- 'bitmap 
'flymake-error-bitmap) (funcall --cl-default-maybe-- 'face 'flymake-error) 
(funcall --cl-default-maybe-- 'before-string (flymake--fringe-overlay-spec 
(overlay-get ov 'bitmap))) (funcall --cl-default-maybe-- 'help-echo (function 
(lambda (window _ov pos) (let ((save-selected-window--state 
(internal--before-with-selected-window window))) (save-current-buffer 
(unwind-protect (progn (select-window (car save-selected-window--state) 
'norecord) (mapconcat (function flymake--diag-text) (flymake-diagnostics pos) 
"\n")) (internal--after-with-selected-window save-selected-window--state))))))) 
(funcall --cl-default-maybe-- 'severity (warning-numeric-level :error)) 
(funcall --cl-default-maybe-- 'priority (+ 100 (overlay-get ov 'severity))))) 
(overlay-put ov 'evaporate t) (overlay-put ov 'flymake-diagnostic diagnostic))))
  flymake--highlight-line(#s(flymake--diag :buffer #<buffer ddl.py> :beg nil 
:end nil :type :note :text "W292 no newline at end of file" :backend nil))
  #f(compiled-function (diag) #<bytecode 0x19f668d>)(#s(flymake--diag :buffer 
#<buffer ddl.py> :beg nil :end nil :type :note :text "W292 no newline at end of 
file" :backend nil))
  mapc(#f(compiled-function (diag) #<bytecode 0x19f668d>) (#s(flymake--diag 
:buffer #<buffer ddl.py> :beg 2915 :end 2916 :type :error :text "F821 undefined 
name 'pdb'" :backend python-flymake) #s(flymake--diag :buffer #<buffer ddl.py> 
:beg nil :end nil :type :note :text "W292 no newline at end of file" :backend 
nil)))
  flymake--handle-report(python-flymake backend-token989 (#s(flymake--diag 
:buffer #<buffer ddl.py> :beg 2915 :end 2916 :type :error :text "F821 undefined 
name 'pdb'" :backend python-flymake) #s(flymake--diag :buffer #<buffer ddl.py> 
:beg nil :end nil :type :note :text "W292 no newline at end of file" :backend 
nil)))
  apply(flymake--handle-report python-flymake backend-token989 
(#s(flymake--diag :buffer #<buffer ddl.py> :beg 2915 :end 2916 :type :error 
:text "F821 undefined name 'pdb'" :backend python-flymake) #s(flymake--diag 
:buffer #<buffer ddl.py> :beg nil :end nil :type :note :text "W292 no newline 
at end of file" :backend nil)))
  #f(compiled-function (&rest args) #<bytecode 0x18f3015>)((#s(flymake--diag 
:buffer #<buffer ddl.py> :beg 2915 :end 2916 :type :error :text "F821 undefined 
name 'pdb'" :backend python-flymake) #s(flymake--diag :buffer #<buffer ddl.py> 
:beg nil :end nil :type :note :text "W292 no newline at end of file" :backend 
nil)))
  python--flymake-parse-output(#<buffer ddl.py> #<process python-flymake> 
#f(compiled-function (&rest args) #<bytecode 0x18f3015>))
  #f(compiled-function (proc event) #<bytecode 0x1134fb5>)(#<process 
python-flymake> "exited abnormally with code 1\n")

Thanks&bye,
so-sorry-to-bother-you-again-ly, lele.
-- 
nickname: Lele Gaifax | Quando vivrò di quello che ho pensato ieri
real: Emanuele Gaifas | comincerò ad aver paura di chi mi copia.
lele@metapensiero.it  |                 -- Fortunato Depero, 1929.