Expanding a variable

Trying to get this to work, not sure how.

Vim 7.4.491

Assume the net result is I have this:

let test_newline = '\n'

Note, that is not:

let test_newline = "\n"

As this value is getting assigned from some other place.

What I want to do is be able to convert it back into the equivalent of:

"\n"

I have tried the following:

let test_newline = "\n"

echo expand(test_newline)

echo expand('"'.test_newline.'"')

echo '"'.test_newline.'"'

echo substitute(test_newline, '\\', "\\\\", 'g')

echo eval(test_newline)

Anyone have any ideas?

Thanks,

Dave

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