>perl -e"$x[-1]->meth"
Modification of non-creatable array value attempted, subscript -1 at -
+e line 1.

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Opposed to: 
>perl -e"undef->meth"
Can't call method "meth" on an undefined value at -e line 1.

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Opinions?

Update:
After further experimentation and consultation with "Somni" on irc, the problem is the attempted autovivification. The same error occurs with $x[-1]="foo" when @x has no elements. If theres no element, there can not be a last element. That makes a certain amount of sense but the error message is a tad misleading.

In reply to Negative array subscript method call bug? by BUU

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