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>perl589\bin\perl -le"@8 = 0..5; @a = 0..7; print $#{ @a }"
7

>perl5100\bin\perl -le"@8 = 0..5; @a = 0..7; print $#{ @a }"
5

>perl -wle"no strict;  my @a = qw( a b c ); print $#{ @a }"
-1

>perl -wle"use strict; my @a = qw( a b c ); print $#{ @a }"
Can't use string ("3") as an ARRAY ref while "strict refs" in use at -
+e line 1.