Hello,

Configuration Information [Automatically generated, do not change]:
Machine: Mac
OS: Darwin
Compiler: gcc
Compilation CFLAGS: Xcode
uname output: Darwin dkuhn 15.6.0 Darwin Kernel Version 15.6.0: Mon Jan  9 
23:07:29 PST 2017; root:xnu-3248.60.11.2.1~1/RELEASE_X86_64 x86_64
Machine Type: x86_64-Apple-Darwin

Bash Version: 3.2
Patch Level: 48
Release Status: relase

Description:
Set a variable readonly changes the behavior of "set -e". Here is a small 
example:

#!/bin/bash
set -e

s=$(false)
echo "abc"

This script exists with exit code 1 as expected after the subshell line.

When the variable s is set to readonly the script does not exit and echoes 
"abc":

#!/bin/bash
set -e

readonly s=$(false)
echo "abc"

This behavior is unexpected. I could reproduce the bug
on ubuntu 16.04 with bash version 4.3-14ubuntu1.1


Regards,
Dennis Kuhn

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