Ksh fails to parse pnut-sh.sh

[laurenthuberdeau]

Context

Sometimes, ksh fails to parse pnut-sh.sh, complaining about an invalid readonly variable name (pnut-sh.sh[7755]: readonly: : invalid variable name). The variable name is correct (readonly __EQ__=61), and other shells can parse and execute the same script without any problem. Strangely, deleting the affected line doesn't necessarily fix the issue, while deleting lines before the affected line can fix it. My guess is that we're hitting some internal ksh limit for certain combinations of pnut-sh.sh.

Rejiggering the code often fixes the issue, but we should look into this error sooner than later.

Here's one pnut-sh.sh script (created from ./bootstrap-pnut-sh.sh --shell ksh --fast on 5b922d941fdeacf82506791ba0ca59b4216c2df4) that causes the error on ksh version 93u+m/1.0.10 2024-08-01: pnut-sh.sh.zip.

[McDutchie]

Bug in ksh 93u+m confirmed. I'm working on it at ksh93/ksh#861

[McDutchie]

Hey @laurenthuberdeau and any other interested parties – I would appreciate if you could test the fix for this bug that I just committed. This is easy to do as follows:

$ git clone -b 1.0 --depth=1 https://github.com/ksh93/ksh
$ cd ksh
$ bin/package make -j5
$ bin/package use

That gets you in an environment where the ksh on $PATH is he latest prerelease 1.0 branch code, without modifying your system in any way. Please throw all your pnut scripts at it and let me know how it goes. Thanks :)