[ast-users] [ksh93] "${arr[@]:off:len}" should expand to nothing rather than an empty string when the specified elements are not existing

[Clark J. Wang]

See following example:

$ ksh --version
  version         sh (AT&T Research) 93u 2011-02-08
$ cat foo.ksh
typeset -a arr=( 0 1 2 3 4 )

for v in "${arr[@]:5}"; do
    echo 1. You should not see this.
done

for v in "${arr[@]:1:0}"; do
    echo 2. You should not see this.
done

for v in "${arr[@]:0:-1}"; do
    echo 3. You should not see this.
done
$ ksh foo.ksh
2. You should not see this.
3. You should not see this.
$

Here "${arr[@]:5}" expands to nothing which makes sense. But
"${arr[@]:1:0}" and "${arr[@]:0:-1}" should be handled in the same way.

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