Compare the output from these two snippets:

$ pugs -e 'my %hash;
           %hash<foo>[0]<bar>[0] = 1;
           my $alias := %hash<foo>[0];
           say ref $alias;
           %hash<foo>[0] = 5;
           say ref $alias'
Hash
Int

$ pugs -e 'my %hash;
           %hash<foo>[0]<bar>[0] = 1;
           my $ref = %hash<foo>[0];
           say ref $ref;
           %hash<foo>[0] = 5;
           say ref $ref'
Hash
Hash
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