Using guile 3.0.1 (also tested with 3.0.4)
Consider following snippet
------
(define (outer-function)
(define (inner-function q w e r t y) ;takes 6 args
#f)
(inner-function 'a 'b 'c 'd 'e)) ;send 5 args
(outer-function)
------
The internally defined function is called with insufficient args. We'd expect error to be
"Wrong number of arguments to inner-function"
Instead the error is
"Wrong number of arguments to a"
Note if the invalid code is not internally-defined, the error is correct:
"Wrong number of arguments to #<procedure inner-function (q w e r t y)>"