Errors in command substitution when typing: echo "$(echo "<TAB>

[Ingo Ruhnke]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64'
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-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 duo 3.18.0-13-generic #14-Ubuntu SMP Fri Feb 6
09:55:14 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

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

Description:

Trying to tab complete the following produces half a screen full of errors:

echo "$(echo "

bash: command substitution: line 3: unexpected EOF while looking for
matching `"'
bash: command substitution: line 4: syntax error: unexpected end of file
bash: command substitution: line 3: unexpected EOF while looking for
matching `"'
bash: command substitution: line 4: syntax error: unexpected end of file
bash: command substitution: line 3: unexpected EOF while looking for
matching `"'
bash: command substitution: line 4: syntax error: unexpected end of file
bash: command substitution: line 3: unexpected EOF while looking for
matching `"'
bash: command substitution: line 4: syntax error: unexpected end of file
bash: command substitution: line 3: unexpected EOF while looking for
matching `"'
bash: command substitution: line 4: syntax error: unexpected end of file

The issue happens even with "bash --noprofile --norc" and on all the
systems I tried.

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