Verbose error output in interactive mode

Configuration Information [Automatically generated, do not change]:

Machine: x86_64

OS: darwin15.0.0

Compiler: clang

Compilation CFLAGS: -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' -DCONF_OSTYPE='darwin15.0.0' -DCONF_MACHTYPE='x86_64-apple-darwin15.0.0' -DCONF_VENDOR='apple' -DLOCALEDIR='/usr/local/Cellar/bash/4.3.42/share/locale' -DPACKAGE='bash' -DSHELL -DHAVE_CONFIG_H -DMACOSX -I. -I. -I./include -I./lib -I./lib/intl -I/private/tmp/bash20150913-75517-1rfmxak/bash-4.3/lib/intl -DSSH_SOURCE_BASHRC

uname output: Darwin john-zeconomy.local 15.6.0 Darwin Kernel Version 15.6.0: Thu Jun 23 18:25:34 PDT 2016; root:xnu-3248.60.10~1/RELEASE_X86_64 x86_64

Machine Type: x86_64-apple-darwin15.0.0

Bash Version: 4.3

Patch Level: 42

Release Status: release

Description:

In an interactive session, when attempting file completion via <Tab>

when a certain type of ill-formed command substitution is present, bash

gives verbose error output relating to "unexpected end of file".

Naturally you can work around this by never making this mistake when

using command substitution, but it seems to me bash can probably guard

for this and avoid disruptive error messages.

Repeat-By:

In an interactive session, type the following:

$ echo "$(echo " ~/

(Note the missing close-parenthesis.)

With the cursor at the end of this line (i.e. after the "/",), enter a

tab.

Bash should prompt with a listing of the given directory. Instead, the

following is shown:

$ echo "$(echo " ~/-bash: command substitution: line 87: unexpected EOF while looking for matching `"'