Gimp (Scheme) How do you return a variable from a script?

Seems like a simple thing but I haven't found an answer.

Custom script. How do you return a variable?

Specifically, I want to return copiedLayer.

(define (script-copy-first-layer inImg)
    (let* 
        ( 
            (layers       (cadr (gimp-image-get-layers inImg) ) )
            (numLayers    (car (gimp-image-get-layers inImg) ) )
            (layer        (aref layers 0))

            (copiedLayer (car (gimp-layer-copy layer TRUE)))
        )

        (gimp-image-add-layer inImg copiedLayer 0)
        (gimp-layer-set-visible copiedLayer TRUE)

        (gimp-layer-set-lock-alpha copiedLayer TRUE)
        (gimp-layer-add-alpha copiedLayer)      
    )
)

(script-fu-register
    "script-copy-first-layer"
    "<Image>/Image/Copy First Layer"
    "Copy First Layer"
    "Black Orchid Studios"
    "Black Orchid Studios"
    "July 2017"
    "RGB*, GRAY*"
    SF-IMAGE    "Image" 0
)

Simply add copiedLayer to the end of the let statement.

I believe this is what you need:

(define (script-copy-first-layer inImg)
    (let* 
        ( 
            (layers       (cadr (gimp-image-get-layers inImg) ) )
            (numLayers    (car (gimp-image-get-layers inImg) ) )
            (layer        (aref layers 0))

            (copiedLayer (car (gimp-layer-copy layer TRUE)))
        )

        (gimp-image-add-layer inImg copiedLayer 0)
        (gimp-layer-set-visible copiedLayer TRUE)

        (gimp-layer-set-lock-alpha copiedLayer TRUE)
        (gimp-layer-add-alpha copiedLayer)    

        copiedLayer
    )
)

(script-fu-register
    "script-copy-first-layer"
    "<Image>/Image/Copy First Layer"
    "Copy First Layer"
    "Black Orchid Studios"
    "Black Orchid Studios"
    "July 2017"
    "RGB*, GRAY*"
    SF-IMAGE    "Image" 0
)