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unset array[0] doesn't delete the element

From: Isaac Good
Subject: unset array[0] doesn't delete the element
Date: Sat, 4 Mar 2017 21:10:00 -0800
User-agent: Mutt/1.7.2 (2016-11-26)

Configuration Information [Automatically generated, do not change]:
Machine: i686
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='i686' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='i686-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 -march=i686 
-mtune=generic -O2 -pipe -fstack-protector-strong 
-DSTANDARD_UTILS_PATH='/usr/bin' -DSYS_BASHRC='/etc/bash.bashrc' 
-Wno-parentheses -Wno-format-security
uname output: Linux netbook 4.9.11-1-ARCH #1 SMP PREEMPT Sun Feb 19 14:09:53 
UTC 2017 i686 GNU/Linux
Machine Type: i686-pc-linux-gnu

Bash Version: 4.4
Patch Level: 12
Release Status: release

        `unset` is broken

        $ arr=(1 2 3); unset arr[-1]; echo "address@hidden"
        1 2 3

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