Hi, I am writing to report that the 5.2 release does not correctly address the regressions introduced by 5.2-rc3 (see https://lists.gnu.org/archive/html/bug-bash/2022-08/msg00104.html for the context). Given a sufficient degree of command substitution nesting, it remains possible for the extglob shell option to be switched on, without having instructed bash to do so.
$ declare -p BASH_VERSION declare -- BASH_VERSION="5.2.0(1)-release" $ BASH_COMPAT=50; shopt extglob; : $(: $(: $(:))); shopt extglob extglob off extglob on When the bug occurs, all levels are affected, as is demonstrated by the attached script. See, also, the original bug report at https://bugs.gentoo.org/873931. -- Kerin Millar
gentoo-bug-873931-reproducer-r1.bash
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