A NOTE has been added to this issue. 
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http://austingroupbugs.net/view.php?id=1150 
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Reported By:                kre
Assigned To:                
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Project:                    1003.1(2016)/Issue7+TC2
Issue ID:                   1150
Category:                   Shell and Utilities
Type:                       Omission
Severity:                   Editorial
Priority:                   normal
Status:                     New
Name:                       Robert Elz 
Organization:                
User Reference:              
Section:                    2.6.3 
Page Number:                2357 - 2358 
Line Number:                75182 - 75224 
Interp Status:              --- 
Final Accepted Text:         
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Date Submitted:             2017-06-16 01:33 UTC
Last Modified:              2018-12-11 15:38 UTC
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Summary:                    exit status of command substitution not properly
specified
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 (0004179) chet_ramey (reporter) - 2018-12-11 15:38
 http://austingroupbugs.net/view.php?id=1150#c4179 
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Re: 4176

Given that command substitutions are performed "beginning to end," as are
all the word expansions, and they are intended to be synchronous, isn't the
last one started the last one finished?

Maybe the thing to do is to make the synchronous nature of command
substitution explicit. I couldn't find anything that says the shell waits
for the subshell environment to finish before moving onto the next
expansion, but everyone seems to do it that way. 

Issue History 
Date Modified    Username       Field                    Change               
====================================================================== 
2017-06-16 01:33 kre            New Issue                                    
2017-06-16 01:33 kre            Name                      => Robert Elz      
2017-06-16 01:33 kre            Section                   => 2.6.3           
2017-06-16 01:33 kre            Page Number               => 2357 - 2358     
2017-06-16 01:33 kre            Line Number               => 75182 - 75224   
2017-06-16 01:46 kre            Note Added: 0003766                          
2017-06-16 06:10 stephane       Note Added: 0003767                          
2017-06-16 09:38 joerg          Note Added: 0003768                          
2017-06-16 09:54 joerg          Note Added: 0003769                          
2017-06-16 10:06 kre            Note Added: 0003770                          
2017-06-16 10:16 joerg          Note Added: 0003771                          
2017-06-16 10:21 joerg          Note Edited: 0003771                         
2017-06-16 11:07 kre            Note Added: 0003772                          
2017-06-16 15:38 stephane       Note Added: 0003773                          
2017-06-16 15:52 joerg          Note Added: 0003774                          
2017-06-16 15:59 joerg          Note Edited: 0003774                         
2017-06-16 16:05 stephane       Note Added: 0003775                          
2017-06-16 16:19 kre            Note Added: 0003776                          
2017-06-16 16:33 shware_systems Note Added: 0003777                          
2017-06-16 16:35 kre            Note Added: 0003778                          
2017-06-16 16:40 kre            Note Added: 0003779                          
2017-06-16 16:43 kre            Note Edited: 0003779                         
2017-06-16 16:45 joerg          Note Added: 0003780                          
2017-06-16 16:45 joerg          Note Edited: 0003780                         
2017-06-17 07:51 shware_systems Note Added: 0003781                          
2017-06-17 08:31 kre            Note Added: 0003782                          
2018-03-09 22:55 stephane       Note Added: 0003936                          
2018-12-11 10:09 kre            Note Added: 0004176                          
2018-12-11 12:49 joerg          Note Added: 0004177                          
2018-12-11 12:50 joerg          Note Edited: 0004177                         
2018-12-11 14:52 chet_ramey     Note Added: 0004178                          
2018-12-11 15:38 chet_ramey     Note Added: 0004179                          
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