bug#38617: should internal defines be callable with incorrect number of args?

[Christopher Lam]

See snippet below.
IMHO the second call to add1 should fail. On guile-2.2.6 it does not error
out.
On guile-2.0 it does throw error (as I think it should).
Is this intentional?

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(define (main)
  (define (add1 num)
    (+ num 1))
  (display "testing")
  (display (add1 2))
  (display (add1 2 3)))

(main)
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