RE: new fboundp behavior weird

[Drew Adams]

> debug-on-entry is using `fboundp'.

I don't think the call to fboundp in debug-on-entry is a problem - it is only in
the `interactive' spec.  And (fboundp 'foo) correctly returns t.

The problem is perhaps due to Emacs 24's removal of this part of debug-on-entry
(from Emacs 23), which handles aliased functions:

;; The function is built-in or aliased to another function.
;; Create a wrapper in which we can add the debug call.
(fset function `(lambda (&rest debug-on-entry-args)
                        ,(interactive-form (symbol-function function))
                        (apply ',(symbol-function function)
                               debug-on-entry-args)))

Dunno.  Whatever the cause, the debugger does not show a frame for bar - it
seems to treat foo as if it were bar.

> (defalias 'foo 'bar)
> (setq debug-on-error t)
> M-x debug-on-entry RET foo TAB
> And then you get the error.

Yes, evalling (foo) using C-x C-e raises the error, in both 24.2 and trunk:

Debugger entered--Lisp error: (void-function foo)
  (foo)
  eval((foo) nil)
  eval-last-sexp-1(nil)
  eval-last-sexp(nil)
  call-interactively(eval-last-sexp nil nil)

But in Emacs 23 (and prior) that does not happen.  Instead, this:

Debugger entered--Lisp error: (void-function bar)
* bar()
* apply(bar nil)
* foo()
  eval((foo))
  eval-last-sexp-1(nil)
  eval-last-sexp(nil)
  call-interactively(eval-last-sexp nil nil)

I agree that there is a bug, presumably in the debugger.  I don't think there is
a problem with fboundp, however.  (fboundp 'foo) correctly returns t.