Well, as I wrote some time ago, one such use are subroutines that just produce data and behave different in void, scalar and list context 

$thingy -> foo (1,2);           # results printed to current filehandl
+e
$string = $thingy -> foo (1,2); # results returned as a single string
@lines  = $thingy -> foo (1,2); # results returned as a bunch of lines

[download]

which works fine and is just fine - if documented.

Another such use would be subroutines which behave like google's "I feel lucky" (scalar) vs. "normal" (list) search.

I agree with you that good uses of wantarray are rare, and the only type of prototype I use now and then is '&', which lets me write subs that get passed blocks, like map or sort.

I don't consider Contextual::Return to be a "good use" mostly because it does the same thing only moreso.

That statement contradicts the OP's last heading - "Better" versions of wantarray.

In reply to Re^3: Use of wantarray Considered Harmful (bad use) by shmem
in thread Use of wantarray Considered Harmful by kyle

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