another case from the case corner case casualty case files

[Martijn Dekker]

$ x=$'\\a\\b\\c\\\001\\d\\e\\f'
$ case $'abc\001def' in $x) echo ok ;; *) echo oops; esac
oops
$ x=$'\\a\\b\\c\\\002\\d\\e\\f'
$ case $'abc\002def' in $x) echo ok ;; *) echo oops; esac
ok

'case' can't match an escaped $'\001' character passed from a variable.
Any other character from $'\002' up works fine. Curious that $'\001'
seems to be handled specially somehow.

- M