"my" variable %hash1 masks earlier declaration in same scope

##</code><code>##

my (%hash1, %hash2, %hash3);

##</code><code>##

# use strict;
use warnings;
%_     = (u => 2);
%hash1 = (b => 3);
# %hash1 = (b => 3);
# %_ = () for my (%hash1,%hash2,%hash3);
# %_ = () for (%hash1,%hash2,%hash3);
print %_, %hash1, "\n";