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bug#29107: 27.0.50; Infinite recursion in Ruby mode

From: Anders Lindgren
Subject: bug#29107: 27.0.50; Infinite recursion in Ruby mode
Date: Wed, 1 Nov 2017 20:52:31 +0100


I just noticed that Ruby mode can go into infinite recursion (or "Lisp nesting exceeds ‘max-lisp-eval-depth’"). I managed to boil it down to the following:

    Evaluate (setq debug-on-error t)

    Open a new file, say test.rb

        func do {

    And press return.

In the backtrace, the following is listed over and over again:

  ruby-smie-rules(:before "{")
  smie-indent--rule-1(:before "{" nil nil)
  smie-indent--rule(:before "{")

It happens in Emacs 25.2 and in a week-old build from the master branch. 

    Anders Lindgren

In GNU Emacs 27.0.50 (build 2, x86_64-apple-darwin16.6.0, NS appkit-1504.83 Version 10.12.5 (Build 16F73))
 of 2017-10-25 built on mbp.lan
Repository revision: bc9300ac5ed3bdf52a2f8b9e217236e1ee76cd02
Windowing system distributor 'Apple', version 10.3.1504
Recent messages:
(New file)
Mark set
s-( is undefined
Mark set
Entering debugger...
Error in debug printer: (void-function t) [1113 times]
Error during redisplay: (ucs-normalize-hfs-nfd-pre-write-conversion 1 92) signaled (error "Variable binding depth exceeds max-specpdl-size") [2 times]
set-auto-coding: Variable binding depth exceeds max-specpdl-size
Back to top level

Configured features:

Important settings:
  value of $LC_CTYPE: UTF-8
  value of $LANG: en_SE.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Special

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

(shadow sort mail-extr emacsbug message rmc puny seq byte-opt dired
dired-loaddefs format-spec rfc822 mml mml-sec password-cache epa derived
epg epg-config gnus-util rmail rmail-loaddefs mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils help-mode
warnings gv bytecomp byte-compile cl-loaddefs cl-lib cconv debug
vc-dispatcher vc-svn ruby-mode smie easymenu elec-pair time-date tooltip
eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel
term/ns-win ns-win ucs-normalize mule-util term/common-win tool-bar dnd
fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode elisp-mode lisp-mode prog-mode register page menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors frame cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote kqueue cocoa ns
multi-tty make-network-process emacs)

Memory information:
((conses 16 209217 10912)
 (symbols 48 20615 1)
 (miscs 40 57 249)
 (strings 32 30746 1897)
 (string-bytes 1 808845)
 (vectors 16 35813)
 (vector-slots 8 721700 15012)
 (floats 8 49 266)
 (intervals 56 218 0)
 (buffers 992 14))

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