From unknown Fri Jun 13 10:29:03 2025 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.509 (Entity 5.509) Content-Type: text/plain; charset=utf-8 From: bug#29107 <29107@debbugs.gnu.org> To: bug#29107 <29107@debbugs.gnu.org> Subject: Status: 27.0.50; Infinite recursion in Ruby mode Reply-To: bug#29107 <29107@debbugs.gnu.org> Date: Fri, 13 Jun 2025 17:29:03 +0000 retitle 29107 27.0.50; Infinite recursion in Ruby mode reassign 29107 emacs submitter 29107 Anders Lindgren severity 29107 normal tag 29107 confirmed thanks From debbugs-submit-bounces@debbugs.gnu.org Wed Nov 01 15:52:46 2017 Received: (at submit) by debbugs.gnu.org; 1 Nov 2017 19:52:46 +0000 Received: from localhost ([127.0.0.1]:46440 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e9z4A-0008HR-7u for submit@debbugs.gnu.org; Wed, 01 Nov 2017 15:52:46 -0400 Received: from eggs.gnu.org ([208.118.235.92]:49730) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1e9z47-0008HA-2O for submit@debbugs.gnu.org; Wed, 01 Nov 2017 15:52:43 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1e9z40-0001cL-6R for submit@debbugs.gnu.org; Wed, 01 Nov 2017 15:52:37 -0400 X-Spam-Checker-Version: SpamAssassin 3.3.2 (2011-06-06) on eggs.gnu.org X-Spam-Level: X-Spam-Status: No, score=0.8 required=5.0 tests=BAYES_50,FREEMAIL_FROM, HTML_MESSAGE,T_DKIM_INVALID autolearn=disabled version=3.3.2 Received: from lists.gnu.org ([2001:4830:134:3::11]:52095) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1e9z40-0001c9-3P for submit@debbugs.gnu.org; Wed, 01 Nov 2017 15:52:36 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:40691) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e9z3y-0003hJ-AE for bug-gnu-emacs@gnu.org; Wed, 01 Nov 2017 15:52:35 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1e9z3w-0001Yo-Tf for bug-gnu-emacs@gnu.org; Wed, 01 Nov 2017 15:52:34 -0400 Received: from mail-vk0-x229.google.com ([2607:f8b0:400c:c05::229]:54868) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1e9z3w-0001YA-O9 for bug-gnu-emacs@gnu.org; Wed, 01 Nov 2017 15:52:32 -0400 Received: by mail-vk0-x229.google.com with SMTP id n70so2146778vkf.11 for ; Wed, 01 Nov 2017 12:52:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=mQGxG++GAPYWMwsN38Kn2g++bTN/7BXCOS8uJIqQOCo=; b=gvtlcY79iDEnu1MQITSy89WlLPvLccLVWz6mQ18Dt4QHvx+eySmZ8MvT9NIJgfi+Mg Rmdv6EayIgnd57nML746yLi1U8EnXA2mMO1JBucCTvBVtI+IF6lV2DB/ISHe/OJEt/Ga 3oI0z0ESpbfgUuXIyRmgIjZlwNpUu/kM7XxOfL3g+tJ8lnf3Iq9v+EHzpAt8FJqL2QAW NtLXE8vkplQeLWnuUnJaoXmJVIBei7H4E9U6Hb+zASKQsQ61fcB1wsAnD8dncvGmutLT CE2cb63g6Ntu74mVDbzEaCJaBIjhSy111dfXbnUnoPZB/qg/EAU581zXozcg500yVlyA GdZQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=mQGxG++GAPYWMwsN38Kn2g++bTN/7BXCOS8uJIqQOCo=; b=NYZ0A1uq1wnK8r3FYncY1FFwIq24FBZZ9o939s+GMyfqcChzqMoGxepmIMVM4a+7TC 3GOw6rCqX9MAu7t1xUaxqEZm8oQeuqo5B+IAt/KCe659dumEgRUe5jU8uH9b/V2I4HOk wZ7PiKLC7YkSKDfMZGu8m9kC1OHRRMMaZn0NHQuw55iJlsWfBiQMHWH2tAOeo+Chg0g+ E5kStCs/89uQ1QnfvWtd+aGn1FPSr/vis61yq/O0wiufoixgFGaAMBFwGvOb08UcWXGz MorAB9hYZVeH7yiRX01mSx/7Rvjp5wjP7+d4j+jQdtPRhJcaAX447Ckm5Xa4P2Le8VHt Nmgw== X-Gm-Message-State: AMCzsaVfVaDIDIhPbKaWjq1dnGg5eR1dDy5boZL3KTldkl4wu+QJjqwz SoBhE+YJdIPl6QZiSv5BJYtgJ0WlKpPUE9yXOlmC5g== X-Google-Smtp-Source: ABhQp+R32JLk11hOd8PmoYcixJgTP/W1sgD9jYCiw61PAsK52LnOB1UE/jQNWDkXw1xiitQ99OXdieyI20rPAPE+0XE= X-Received: by 10.31.254.5 with SMTP id l5mr716097vki.136.1509565951673; Wed, 01 Nov 2017 12:52:31 -0700 (PDT) MIME-Version: 1.0 Received: by 10.31.45.1 with HTTP; Wed, 1 Nov 2017 12:52:31 -0700 (PDT) From: Anders Lindgren Date: Wed, 1 Nov 2017 20:52:31 +0100 Message-ID: Subject: 27.0.50; Infinite recursion in Ruby mode To: bug-gnu-emacs@gnu.org Content-Type: multipart/alternative; boundary="94eb2c149e62508b18055cf136c5" X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.6.x X-Received-From: 2001:4830:134:3::11 X-Spam-Score: -4.0 (----) X-Debbugs-Envelope-To: submit X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -4.0 (----) --94eb2c149e62508b18055cf136c5 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Hi! I just noticed that Ruby mode can go into infinite recursion (or "Lisp nesting exceeds =E2=80=98max-lisp-eval-depth=E2=80=99"). I managed to boil = it down to the following: Evaluate (setq debug-on-error t) Open a new file, say test.rb Type: func do { And press return. In the backtrace, the following is listed over and over again: ruby-smie--indent-to-stmt() ruby-smie-rules(:before "{") smie-indent--rule-1(:before "{" nil nil) smie-indent--rule(:before "{") smie-indent-keyword() run-hook-with-args-until-success(smie-indent-keyword) smie-indent-calculate() smie-indent-virtual() It happens in Emacs 25.2 and in a week-old build from the master branch. Sincerely, 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: t (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: JPEG NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS 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. Features: (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)) --94eb2c149e62508b18055cf136c5 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
Hi!

I just noticed that Ruby= mode can go into infinite recursion (or "Lisp nesting exceeds =E2=80= =98max-lisp-eval-depth=E2=80=99"). I managed to boil it down to the fo= llowing:

=C2=A0 =C2=A0 Evaluate (setq debug-on-err= or t)

=C2=A0 =C2=A0 Open a new file, say test.rb
=C2=A0 =C2=A0 Type:

=C2=A0 =C2=A0 =C2=A0 = =C2=A0 func do {

=C2=A0 =C2=A0 And press return.

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

=C2=A0 ruby-smie--indent-to-stmt()
=C2=A0 ruby-smie-rules(:before "{")
=C2=A0 smie-= indent--rule-1(:before "{" nil nil)
=C2=A0 smie-indent-= -rule(:before "{")
=C2=A0 smie-indent-keyword()
=C2=A0 run-hook-with-args-until-success(smie-indent-keyword)
= =C2=A0 smie-indent-calculate()
=C2=A0 smie-indent-virtual()
=

It happens in Emacs 25.2 and in a week-old build from t= he master branch.=C2=A0

Sincerely,
= =C2=A0 =C2=A0 Anders Lindgren

In GNU Emacs 27.0.50= (build 2, x86_64-apple-darwin16.6.0, NS appkit-1504.83 Version 10.12.5 (Bu= ild 16F73))
=C2=A0of 2017-10-25 built on mbp.lan
Reposi= tory revision: bc9300ac5ed3bdf52a2f8b9e217236e1ee76cd02
Windowing= system distributor 'Apple', version 10.3.1504
Recent mes= sages:
t
(New file)
Mark set
s-( is= undefined
Mark set
Entering debugger...
Erro= r in debug printer: (void-function t) [1113 times]
Error during r= edisplay: (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:
JPEG NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS
=
Important settings:
=C2=A0 value of $LC_CTYPE: UTF= -8
=C2=A0 value of $LANG: en_SE.UTF-8
=C2=A0 locale-cod= ing-system: utf-8-unix

Major mode: Special

Minor modes in effect:
=C2=A0 tooltip-mode: t
=C2=A0 global-eldoc-mode: t
=C2=A0 electric-indent-mode:= t
=C2=A0 mouse-wheel-mode: t
=C2=A0 tool-bar-mode: t
=C2=A0 menu-bar-mode: t
=C2=A0 file-name-shadow-mode: t<= /div>
=C2=A0 global-font-lock-mode: t
=C2=A0 font-lock-mode: = t
=C2=A0 blink-cursor-mode: t
=C2=A0 auto-composition-m= ode: t
=C2=A0 auto-encryption-mode: t
=C2=A0 auto-compr= ession-mode: t
=C2=A0 buffer-read-only: t
=C2=A0 line-n= umber-mode: t
=C2=A0 transient-mark-mode: t

<= div>Load-path shadows:
None found.

Featu= res:
(shadow sort mail-extr emacsbug message rmc puny seq byte-op= t dired
dired-loaddefs format-spec rfc822 mml mml-sec password-ca= che epa derived
epg epg-config gnus-util rmail rmail-loaddefs mm-= decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-util= s mailheader sendmail
rfc2047 rfc2045 ietf-drums mm-util mail-prs= vr mail-utils help-mode
warnings gv bytecomp byte-compile cl-load= defs cl-lib cconv debug
vc-dispatcher vc-svn ruby-mode smie easym= enu elec-pair time-date tooltip
eldoc electric uniquify ediff-hoo= k vc-hooks lisp-float-type mwheel
term/ns-win ns-win ucs-normaliz= e mule-util term/common-win tool-bar dnd
fontset image regexp-opt= fringe tabulated-list replace newcomment
text-mode elisp-mode li= sp-mode prog-mode register page menu-bar
rfn-eshadow isearch time= r select scroll-bar mouse jit-lock font-lock
syntax facemenu font= -core term/tty-colors frame cl-generic cham georgian
utf-8-lang m= isc-lang vietnamese tibetan thai tai-viet lao korean
japanese euc= jp-ms cp51932 hebrew greek romanian slovak czech european
ethiopi= c indian cyrillic chinese composite charscript charprop
case-tabl= e 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 inf= ormation:
((conses 16 209217 10912)
=C2=A0(symbols 48 2= 0615 1)
=C2=A0(miscs 40 57 249)
=C2=A0(strings 32 30746= 1897)
=C2=A0(string-bytes 1 808845)
=C2=A0(vectors 16 = 35813)
=C2=A0(vector-slots 8 721700 15012)
=C2=A0(float= s 8 49 266)
=C2=A0(intervals 56 218 0)
=C2=A0(buffers 9= 92 14))

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Thu, 09 Nov 2017 18:13:13 -0800 (PST) From: Noam Postavsky To: Anders Lindgren Subject: Re: bug#29107: 27.0.50; Infinite recursion in Ruby mode References: Date: Thu, 09 Nov 2017 21:13:12 -0500 In-Reply-To: (Anders Lindgren's message of "Wed, 1 Nov 2017 20:52:31 +0100") Message-ID: <87zi7u3mpz.fsf@users.sourceforge.net> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.90 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spam-Score: 0.2 (/) X-Debbugs-Envelope-To: 29107 Cc: 29107@debbugs.gnu.org X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: 0.2 (/) tags 29107 + confirmed quit Anders Lindgren writes: > I just noticed that Ruby mode can go into infinite recursion (or > "Lisp nesting exceeds =E2=80=98max-lisp-eval-depth=E2=80=99"). I managed = to boil it > down to the following: > > =C2=A0 =C2=A0 Evaluate (setq debug-on-error t) > > =C2=A0 =C2=A0 Open a new file, say test.rb > =C2=A0 =C2=A0 Type: > > =C2=A0 =C2=A0 =C2=A0 =C2=A0 func do { > > =C2=A0 =C2=A0 And press return. > Entering debugger... > Error in debug printer: (void-function t) [1113 times] By the way, this funny message seems to be caused by loading cl-print while stack has been used up by the inf looping. If setting debugger-print-function to prin1, or loading cl-print before triggering the bug, that message doesn't show up. From debbugs-submit-bounces@debbugs.gnu.org Fri Jan 01 21:21:01 2021 Received: (at 29107-done) by debbugs.gnu.org; 2 Jan 2021 02:21:01 +0000 Received: from localhost ([127.0.0.1]:35088 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1kvWXN-0000Eg-0V for submit@debbugs.gnu.org; Fri, 01 Jan 2021 21:21:01 -0500 Received: from mail-ej1-f51.google.com ([209.85.218.51]:45585) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1kvWXK-0000ES-5J for 29107-done@debbugs.gnu.org; Fri, 01 Jan 2021 21:20:59 -0500 Received: by mail-ej1-f51.google.com with SMTP id qw4so29446630ejb.12 for <29107-done@debbugs.gnu.org>; Fri, 01 Jan 2021 18:20:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:subject:to:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=icsYMlifvNkEAYLH4nzJuBil/aN1dCXYNup1lvoMKCs=; b=Lw0Sd22t2mgPcB24RM+X7uoT4YgA8IoeKQg0ZUCay31qXFbYE9pb8GVUc1oNYULZ+8 3XX5hkWjI1x9z7pYRtx7ARVgJHyMt3fGJ7x5i7MFtjdCifjdG1FwIx/W8btyF2EstOp7 CQbWdIf9FC7rtEAbB1+IrkPMGcw6zSa6RkUX3pU9BnLT9n3Eoi5dOLKV878Uruk49Ytk IxOcabTZyApuSdo4kQpefTxezwbOCy7boZ48apxpJg15L0fbN4fECpv5yesECGwXGVQK xFyf6LY01mkYZ0I8njxpWrIXbdNwh3DIBeLYSbwWOIDl8SyIvWdaTL97qMrrvmdu/KSL u5MQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:subject:to:references:from:message-id :date:user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=icsYMlifvNkEAYLH4nzJuBil/aN1dCXYNup1lvoMKCs=; b=M/Q25pFPWC9iK9scT8XW7OCgSmh6kqMlDzpRD4POJYObX6RtCsXoFJRw+bI32SRrht SiT14FhCaCzgwbgqnwUqvjvsYkOhsEok/mxzMwo2lTjF3J1aJSMFiUCO3s9EqSr6fPir Lud6USzrIwZjGo+0FSh1RtYESJhnty1uCBh78HOABqMLhUF12kzIBBtS8EiM5eHz+DpR CDsKaJoILBhUvRv6OOPhKHt20K+QM8tdkbaNZZIBIgLsL39+yvQPV/Nc+NCksiaZJsZU EP0kXR5fvPC/UDxxIsn+P1YbPLlHgnrYloShhwoqA0VZKvRXtoD0M58r/SruvScEY9GA Nc2A== X-Gm-Message-State: AOAM532K9IFj/kKBU81Nbz4N0ookZGtGfNnPg+L0z+QP1xn3HEnTYJyD 3J9zwC8EtSSn9sh7jlV6tsMvWrhOxG0oLg== X-Google-Smtp-Source: ABdhPJwViIJXDXCfPcbgHRSkEuMhd0ikyQu7qLsPDZx+CRbVa6BK7OBx9b8OBoseyypJap+CAJ/ClA== X-Received: by 2002:a17:906:3146:: with SMTP id e6mr44767404eje.363.1609554052107; Fri, 01 Jan 2021 18:20:52 -0800 (PST) Received: from [192.168.0.6] ([46.251.119.176]) by smtp.googlemail.com with ESMTPSA id m7sm41601371eds.73.2021.01.01.18.20.50 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 01 Jan 2021 18:20:51 -0800 (PST) Subject: Re: bug#29107: 27.0.50; Infinite recursion in Ruby mode To: Anders Lindgren , 29107-done@debbugs.gnu.org References: From: Dmitry Gutov Message-ID: <916b6d5d-9849-1538-4ab4-25f8f543c80c@yandex.ru> Date: Sat, 2 Jan 2021 04:20:49 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-Spam-Score: -2.2 (--) X-Debbugs-Envelope-To: 29107-done X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: debbugs-submit-bounces@debbugs.gnu.org Sender: "Debbugs-submit" X-Spam-Score: -3.2 (---) Version: 28.1 Hi Anders, On 01.11.2017 21:52, Anders Lindgren wrote: > 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 >     Type: > >         func do { > >     And press return. > > In the backtrace, the following is listed over and over again: > >   ruby-smie--indent-to-stmt() >   ruby-smie-rules(:before "{") >   smie-indent--rule-1(:before "{" nil nil) >   smie-indent--rule(:before "{") >   smie-indent-keyword() >   run-hook-with-args-until-success(smie-indent-keyword) >   smie-indent-calculate() >   smie-indent-virtual() > > It happens in Emacs 25.2 and in a week-old build from the master branch. Sorry about the long wait, it didn't seem like a critical issue given that the code in question was either a typo, or a very weird way to write a block. Please correct me if I'm wrong here. Either way, it should be fixed now in master, commit 0f561ee553. 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