bug#17902: 24.4.50; (elisp) `Function Debugging' still says redefining a function cancels `debug-on-entry', which is no longer true

bug#17902: 24.4.50; (elisp) `Function Debugging' still says redefining a function cancels `debug-on-entry', which is no longer true

[Drew Adams]

Subject line says it all.  And it's a WARNING, no less (should never
have been a warning).

     *Warning:* if you redefine a function after using `debug-on-entry'
     on it, the code to enter the debugger is discarded by the
     redefinition.  In effect, redefining the function cancels the
     break-on-entry feature for that function.

This feature was intentionally removed in Emacs 24.  Invoking the
function  still opens the debugger, even after you redefine the
function, until you use `cancel-debug-on-entry' for it.


In GNU Emacs 24.4.50.1 (i686-pc-mingw32)
 of 2014-06-28 on ODIEONE
Bzr revision: 117431 rgm@gnu.org-20140628015517-eku6hj8mpgcvfnso
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --prefix=/c/Devel/emacs/snapshot/trunk
 --enable-checking=yes,glyphs 'CFLAGS=-O0 -g3'
 LDFLAGS=-Lc:/Devel/emacs/lib 'CPPFLAGS=-DGC_MCHECK=1
 -Ic:/Devel/emacs/include''

bug#17902: 24.4.50; (elisp) `Function Debugging' still says redefining a function cancels `debug-on-entry', which is no longer true

[Drew Adams]

I guess this text too needs updating (?), in node `Debugger Commands':

`l'
     Display a list of functions that will invoke the debugger when
     called.  This is a list of functions that are set to break on
     entry by means of `debug-on-entry'.  *Warning:* if you redefine
     such a function and thus cancel the effect of `debug-on-entry', it
     may erroneously show up in this list.

And again, the last sentence (which might need updating) should not be
shown as a WARNING. There is no danger to warn of.  It is simply a note.

bug#17902: 24.4.50; (elisp) `Function Debugging' still says redefining a function cancels `debug-on-entry', which is no longer true

[Drew Adams]

Uh, no, this should NOT have been merged with 13061.

This report does not ask to revert the change in behavior or to at least make the behavior user-configurable. This report just points out that the behavior is not what the doc says it is.

This is a doc bug report. #13061 is a product behavior report.  They should not be merged.

bug#17902: 24.4.50; (elisp) `Function Debugging' still says redefining a function cancels `debug-on-entry', which is no longer true

[Stefan Monnier]

> Subject line says it all.  And it's a WARNING, no less (should never
> have been a warning).

Thanks, I removed the now incorrect text.


        Stefan