I'm not really sure that Perl syntax allows you to alias hash entry scalars, but you can achieve the effect by using Data::Alias:

use Data::Alias;
use feature 'say';
$baz{'buf'} = 'Hello';
alias $foo{'bar'} = $baz{'buf'};
say $foo{'bar'};
$foo{'bar'} = 'World';
say $baz{'buf'};
$baz{'new'} = 'old';
say $foo{'old'};

__END__
Hello
World
Use of uninitialized value in say at ...

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In reply to Re^2: Aliasing hash-element and scalar? (Not Solved Yet) by Corion
in thread Aliasing hash-element and scalar? by LanX

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