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Re: syntax error while parsing a case command within `$(...)'

From: Koichi Murase
Subject: Re: syntax error while parsing a case command within `$(...)'
Date: Sun, 14 Feb 2021 17:00:06 +0800

2021年2月14日(日) 15:41 Andreas Kusalananda Kähäri <andreas.kahari@abc.se>:
> And using (x) doesn't help:
> % bash -c ': $(case x in (x) esac)'
> bash: -c: line 1: unexpected EOF while looking for matching `)'
> bash: -c: line 2: syntax error: unexpected end of file

This is interesting. I think this is just an oversight. A quick fix
like the attached patch should be fine. [ Note: The patch seems to
work fine, but I haven't carefully read the code, so I'm not sure if
this fix is really correct. ]

2021年2月14日(日) 6:23 Robert Elz <kre@munnari.oz.au>:
> [...]
> This problem has been known for a LONG time, without it being fixed.

I guess you are using Bash for so many years, but it was fixed in Bash
4.0 (2009). You can see the result of the following command:

$ bash-4.0 -c ': $(case x in x) :; esac)'

2021年2月14日(日) 6:23 Robert Elz <kre@munnari.oz.au>:
> Fixing it would take major work in the parser, so the chances of it
> happening are not all that great.

The case reported here appears to be just an oversight in the fix of
Bash 4.0, so I guess an additional fix should be relatively easy.


Attachment: 0001-fix-parsing-of-case-x-in-x-esac.patch
Description: Binary data

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