bind command dies on bad syntax

[Andrew Kurn]

Configuration Information [Automatically generated, do not change]:
Machine: i586
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i586' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i586-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H   -I.  -I../. -I.././include -I.././lib  -D_FORTIFY_SOURCE=2 -g 
-O2 -fstack-protector-strong -Wformat -Werror=format-security -Wall
uname output: Linux sc-physb05 3.16.0-4-686-pae #1 SMP Debian 
3.16.7-ckt11-1+deb8u5 (2015-10-09) i686 GNU/Linux
Machine Type: i586-pc-linux-gnu

Bash Version: 4.3
Patch Level: 30
Release Status: release

Description:
When I put an extra space in the bind command, it fails silently
and corrupts the keyboard map.  Lower-case h no longer works.

Repeat-By:
bind Control-a: forward-search-history