`foo=1 declare -r foo' prints an error message but its exit status is zero

From	ziyunfei <446240525@qq.com>
Newsgroups	gnu.bash.bug
Subject	`foo=1 declare -r foo' prints an error message but its exit status is zero
Date	2015-09-09 14:17 +0800
Message-ID	<mailman.730.1441779466.19560.bug-bash@gnu.org> (permalink)

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$ foo=1 declare -r foo
bash: foo: readonly variable
$ echo $?
0
$ echo $foo
1

Is this a bug? 

$ bar=1 readonly bar; # throw an error in Bash 4.2, fixed in Bash 4.3

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`foo=1 declare -r foo' prints an error message but its exit status is zero ziyunfei <446240525@qq.com> - 2015-09-09 14:17 +0800

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