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moo@cow[26]~>perl -Mstrict -le 'my $w = 1; my $w; print "OHAI"'
OHAI
...

moo@cow[29]~>perl -Mstrict -Mwarnings=FATAL,misc -le 'my $w = 1; my $w
+; print "OHAI"'
"my" variable $w masks earlier declaration in same scope at -e line 1.