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Re: Parsing error when "case" in "for" in $()


From: Eric Blake
Subject: Re: Parsing error when "case" in "for" in $()
Date: Tue, 11 Sep 2012 16:27:53 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120828 Thunderbird/15.0

On 09/11/2012 08:50 AM, Benoit Vaugon wrote:

> Bash Version: 4.1
> Patch Level: 7

> Repeat-By:
>   echo $(for x in whatever; do case y in *) echo 42;; esac; done)

The syntax error is still present in bash 4.2 patchlevel 37:

$  echo $(for x in whatever; do case y in *) echo 42;; esac; done)
bash: syntax error near unexpected token `;;'
$ bash --version | head -n1
GNU bash, version 4.2.37(1)-release (x86_64-redhat-linux-gnu)

and also present in very recent ksh and zsh:

# ksh -c 'echo $(for x in whatever; do case y in *) echo 42;; esac; done) '
ksh: syntax error at line 1: `;;' unexpected

but not in mksh or dash:

# dash -c 'echo $(for x in whatever; do case y in *) echo 42;; esac; done) '
42

Looks like you found a real bug, but a tough one to fix if even ksh gets
it wrong.

-- 
Eric Blake   address@hidden    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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