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f73b8617dd
Reproducer:
$ namespace test { x=123; typeset -g x=456; }
$ echo $x ${.test.x}
456 123
$ namespace test { typeset -Q; }
arch/darwin.i386-64/bin/ksh: typeset: -Q: unknown option
[usage message snipped for brevity]
$ echo $x ${.test.x}
123 123 <== expected: 123 456
$ x=789
$ echo $x ${.test.x}
789 789 <== expected: 789 456
$ # look at that, we never left the namespace...
When prefixing the erroneous 'typeset' with 'command', the problem
does not occur. 'command' disables the properties of special
built-ins such as exit on error. So, when a special built-in exits
on error, the parent scope is not properly resotred.
This bug exists in every ksh93 version with SHOPT_NAMESPACE so far.
src/cmd/ksh93/sh/xec.c: sh_exec():
- Before entering a namespace, use sh_pushcontext and sigsetjmp to
make sure we return here if sh_exit() is called, e.g. when a
special builtin throws an error, to ensure the parent scope
(oldnspace) is restored.
Thanks to @hyenias for making me aware of this bug.
Discussion: https://github.com/ksh93/ksh/issues/479#issuecomment-1140468965
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