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[BUG] With null IFS, ${1+$*}, ${var-$*}, etc. don't generate fields

From: Martijn Dekker
Subject: [BUG] With null IFS, ${1+$*}, ${var-$*}, etc. don't generate fields
Date: Sun, 19 Feb 2017 02:35:41 +0100
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:45.0) Gecko/20100101 Thunderbird/45.7.0

When IFS is null, unquoted $* within an unquoted substitution (e.g.
${1+$*} or ${unset_var-$*}) joins the PPs together into one field, as if
either "$*" or the whole substitution were quoted.

POSIX says the unquoted substitution is supposed to generate one field
for each positional parameter, with further field splitting inactive due
to empty IFS.

Unquoted $* outside of a substitution does this correctly; the bug only
occurs within one.


bash -c 'IFS=; set "abc" "def ghi" "jkl";
        set ${1+$*}; printf "[%s]\\n" "$#" "$@"'

Actual output:
[abcdef ghijkl]

Expected output (as produced by every other shell):
[def ghi]

Bug confirmed on bash 3.2.57, 4.3.30, 4.4.12.

Bug confirmed *not* present on bash 2.05b.


- M.

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