GNU bug report logs - #59469
29.0.50; Eshell "for" loop: Calling a non-lisp command (example: /usr/bin/tail) sets the variable exported in the {} block of "for var in list {}" to nil

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From: Milan Zimmermann <milan.zimmermann <at> gmail.com>
To: 59469 <at> debbugs.gnu.org
Subject: bug#59469: Adding a simpler duplication of the issue
Date: Mon, 21 Nov 2022 21:50:03 -0500

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A simpler duplication shows the issue is below.

It appears the issue is  is not related to the "for loop" - it can be
duplicated just writing code inside the eshell { .. } block.

To duplicate, please create a file ccc.el.gz - something the gzip does not
fail on.

Then, On the eshell prompt, enter the following code:

 $  export aaa="This is contents of aaa"
 {
# create a variable in this block
export bbb=$aaa;
echo "Before gzip: aaa=$aaa"
echo "Before gzip: bbb=$bbb";
gzip --decompress ccc.el.gz;
echo "After gzip: aaa=$aaa"
echo "After gzip: bbb=$bbb";
}
Before gzip: aaa=This is contents of aaa
Before gzip: bbb=This is contents of aaa
After gzip: aaa=This is contents of aaa
After gzip: bbb=nil
 $

Same bug: After the call to non-elisp program, /usr/bin/gzip, a previously
exported variable bbb (exported inside the block) is nullified.

Thanks

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