Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: x86_64-pc-linux-gnu-gcc
Compilation CFLAGS: -march=native -ggdb -O2 -pipe -Wno-parentheses
-Wno-format-security
uname output: Linux a1i15 4.19.102-gentoo #1 SMP Fri Feb 7 14:32:53 CET 2020
x86_64 Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz GenuineIntel GNU/Linux
Machine Type: x86_64-pc-linux-gnu
Bash Version: 5.0
Patch Level: 16
Release Status: release
Description:
The GNU Bash Reference Manual Version 5.0 says about test -v:
'-v VARNAME'
True if the shell variable VARNAME is set (has been
assigned a value).
However, it doesn't always return true when VARNAME is an
(indexed or associative) array that has been assigned a value.
See also Gentoo bug https://bugs.gentoo.org/710076 for some
context and additional examples.
Repeat-By:
$ var1=()
$ var2[1]=a
$ var3=( b c )
$ declare -A var4; var4["foo"]=d
$ declare -p var0 var1 var2 var3 var4
bash: declare: var0: not found
declare -a var1=()
declare -a var2=([1]="a")
declare -a var3=([0]="b" [1]="c")
declare -A var4=([foo]="d" )
$ [[ -v var0 ]]; echo $?
1
$ [[ -v var1 ]]; echo $?
1
$ [[ -v var2 ]]; echo $?
1
$ [[ -v var3 ]]; echo $?
0
$ [[ -v var4 ]]; echo $?
1
I would expect 1 only for var0, but 0 for all the others (which
have been assigned a value).
In fact, bash version 4.2.53 behaves as expected, whereas I get
the above result with versions 4.4.23 and 5.0.16.
