lexical-bindings.el -- stuck with void-variable x error

[cyberthal]

I assume this is user error, but I'm still stuck. Cheat sheet branch is same as main branch for this file.

I've gone through about half of the koans, in alphabetical order, and am now stuck on lexical-bindings.el, a concept I already understood.

Here's my solution:

(elisp-koans/deftest
 elisp-koans/lexical-bindings-closure-interactions ()
 "An illustration of how lexical closures may interact."
 (let ((tangled-funs-1 (elisp-koans/two-funs 1))
       ;; ((lambda nil 1) (lambda (y) (setq x y)))
       (tangled-funs-2 (elisp-koans/two-funs 2)))
   ;; ((lambda nil 2) (lambda (y) (setq x y)))

   (should (equal 1 (funcall (first tangled-funs-1))))
   (funcall (second tangled-funs-1) 0) ; x=0
   (should (equal 0 (funcall (first tangled-funs-1))))

   (should (equal 2 (funcall (first tangled-funs-2))))
   (funcall (second tangled-funs-2) 100) ; x=100
   (should (equal 100 (funcall (first tangled-funs-2))))))

Running elisp-koans/run-test returns

Selector: "elisp-koans/lexical-bindings-closure-interactions"
Passed:  0
Failed:  1 (1 unexpected)
Skipped: 0
Total:   1/1

Started at:   2021-02-22 08:28:44+0800
Finished.
Finished at:  2021-02-22 08:28:44+0800

F

F elisp-koans/lexical-bindings-closure-interactions
    An illustration of how lexical closures may interact.
    (void-variable x)

I don't know how to run this with a debugger to get a more meaningful output.