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    my $subname = 'baz';
    my $param   = { abc => 'xyz' }; # or an object. whatever.

    eval 'foo->' . "$subname( \$param )";

    # first, the string that is to be eval'ed is created
    'foo->' . "$subname( \$param )"  => 'foo->baz( $param )'
...
    foo->baz( $param );

    # where $param is the ref to a hash

    # suppose we use "$subname( $param )"
    'foo->' . "$subname( $param )" => "foo->baz( 'HASHx(....)' )"
...
    # so no interpolation is done in the first step...
    foo->$subname( $param ); # ah, but this is perfectly valid!