namerefs to var[idx]

[Stephane Chazelas <stephane@xxxxxxxxxxxx>]

$ f() { typeset -nu v=$1; echo ${v[1]}; }
$ a=abcd
$ f 'a[2,3]'
b

OK but:

$ f() { typeset -nu v=$1; echo $v[1]; }
$ f 'a[2,3]'
f: no matches found: bc[1]

It's amazing that these actually work:

$ f() { typeset -nu v=$1; v[1]=foo; }
$ f a
$ echo $a
foo2345
$ f 'a[6]'
$ echo $a
foo23foo5

This one not really:

$ a=12345
$ f 'a[2,3]'
$ echo $a
1foo45

In that one could expect the first character of the "23"
substring to be changed to "foo", but I can see that's asking
quite a lot.

-- 
Stephane