You probably want 

$tests{2} = \%blah2;

[download]

(i.e., you need to assign a hashref when you're in scalar context...  Otherwise, you get the number of used/allocated buckets of the hash — which is why you see the error 'Can't use string ("2/8") as a HASH ref while "strict refs" in use...')

In reply to Re: hash with a hash by almut
in thread hash with a hash by rsiedl

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