Bug#867827: Incremental regexp search crashes after pressing backslash

[Ben Hutchings <ben@decadent.org.uk>]

Package: info
Version: 6.4.0.dfsg.1-2
Severity: important

When I press C-s, \, info writes:

    regexp error: Trailing backslash

and then segfaults.

Ben.

-- System Information:
Debian Release: buster/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'unstable'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.11.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8), LANGUAGE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages info depends on:
ii  install-info  6.4.0.dfsg.1-2
ii  libc6         2.24-12
ii  libtinfo5     6.0+20161126-1

info recommends no packages.

Versions of packages info suggests:
pn  texinfo-doc-nonfree  <none>

-- no debconf information