laptop:~> perl -Mdiagnostics -e 'my @x; $x[-1]->meth'
Modification of non-creatable array value attempted, subscript -1 at -e line 1 (#1)
    (F) You tried to make an array value spring into existence, and the
    subscript was probably negative, even counting from end of the array
    backwards.
    
Uncaught exception from user code:
        Modification of non-creatable array value attempted, subscript -1 at -e line 1.