I was going to suggest this too after reading PM's post. I would suggest that for whatever reason a list operator was used on a scalar, including a hold over form another language (Ruby and perl5), a warning should be issued. Most likely to be an error.

On 06/21/2010 11:05 PM, yary wrote:
Warning on using any list-y op on a scalar seems like a good idea, and
the fact that the idea arose after a perl5 misunderstanding now looks
like a "red herring". That is, while warning on "only"
reverse-on-a-scalar may be a bad idea and perl5 specific, I'd vote for
warning on all apparent mis-uses of list ops on scalars as a generally

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