Follow-up Comment #2, sr #111102 (group autoconf): Thanks, I wouldn't have thought that this is worth such a long patch.
Two minor nits:
+verbose+
You may see usages like @samp{$@{1+"$@@"@}} in older shell scripts
designed to work around a portability problem in ancient shells.
Unfortunately this runs afoul of bugs in more-recent shells, and
nowadays it is better to use plain @samp{"$@@"} insteadl.
typo: ^^^^^^^^
-verbose-
+verbose+
For many years shell scripts worked around this portability problem by
using @samp{$@{1+"$@@"@}} instead of @samp{"$@@"}, and you may see this
usage in older scripts. Unfortunately, @samp{$@{1+"$@@"@}} does not
work with @command{ksh93} M 93t+ (2009) as shipped in AIX 7.2 (2015),
as this shell drops trailing arguments:
probably insert "empty" ^ here?
-verbose-
BTW, what I haven't tested yet (and no AIX around right now):
* whether *non-trailing* empty arguments are dropped as well
* whether the ${foo+"$bar"} mechanism is flawed in general on that shell
(after all, the symptoms smell of double evaluation)
Could try that on Monday.
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