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Command substitution before while loop

From: Krystian Wojtas
Subject: Command substitution before while loop
Date: Wed, 01 Apr 2020 17:05:24 +0000

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-musl
Compiler: gcc
Compilation CFLAGS: -g -O2 -Wno-parentheses -Wno-format-security
uname output: Linux bc55e8b47896 5.3.0-42-generic #34~18.04.1-Ubuntu SMP Fri 
Feb 28 13:42:26 UTC 2020 x86_64 Linux
Machine Type: x86_64-pc-linux-musl

Bash Version: 5.0
Patch Level: 16
Release Status: release

        Making comments in pipes using command substitution is very helpful. 
But there is syntax error it it is done just before while loop. Could it be 
considered as bug?

        Script is attached. Ouput
bash-5.0# ./comments.sh
./comments.sh: line 20: syntax error near unexpected token `do'
./comments.sh: line 20: `while read variable; do'

Best regards,
Krystian Wojtas

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