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Re: bin/51145: /bin/sh accepts '()' as a valid sub-shell

The following reply was made to PR bin/51145; it has been noted by GNATS.

From: Robert Elz <kre%munnari.OZ.AU@localhost>
Subject: Re: bin/51145: /bin/sh accepts '()' as a valid sub-shell
Date: Mon, 16 May 2016 12:15:24 +0700

 To add to my own report, the same problem exists with
 	{ }
 (and to both of these forms with a newline between -  which shouldn't
 make a difference, and doesn't).
 It is interesting that zsh does not object to the form using { (bash
 and dash both do - which mostly guarantees most scripts do not use it.)
 One effect that fixing this might have on some people/scripts is that
 it will no longer be possible to make a truly empty function, like
 f() {
 bash and dash don't permit that, other shells (including NetBSD's) do.
 The shell grammar (in
 does not permit any of this either.)
 The empty function "rewrite" is 
 f() { :
 or any equivalent form, like: f(){ :;}

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