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Byte-compiling the following file:

(if (fboundp 'car)
    (defalias 'mycar 'car)
  (defun mycar (_l) (error "what")))

(defun foo ()
  (mycar nil))

results in the byte compiler warning

  Warning: the function `mycar' is not known to be defined.

However, the function is clearly always defined.  Since this trick is
rather common, the byte compiler should know about it.



In GNU Emacs 25.0.50.1 (x86_64-pc-linux-gnu, GTK+ Version 3.10.8)
 of 2014-12-01 on *hidden*, modified by Debian
Windowing system distributor `The X.Org Foundation', version 11.0.11501000
System Description:	Ubuntu 14.04 LTS

Configured using:
 `configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-pop=yes
 --enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/25.0.50/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.0.50/site-lisp:/usr/share/emacs/site-lisp
 --with-crt-dir=/usr/lib/x86_64-linux-gnu --build x86_64-linux-gnu
 --prefix=/usr --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --with-pop=yes
 --enable-locallisppath=/etc/emacs-snapshot:/etc/emacs:/usr/local/share/emacs/25.0.50/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.0.50/site-lisp:/usr/share/emacs/site-lisp
 --with-crt-dir=/usr/lib/x86_64-linux-gnu --with-x=yes
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 -fstack-protector --param=ssp-buffer-size=4 -Wformat
 -Werror=format-security -Wall' CPPFLAGS=-D_FORTIFY_SOURCE=2
 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

Configured features:
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NOTIFY LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB

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Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Making completion list...
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next-line: End of buffer
Quit
Saving file /tmp/bytetest.el...
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Load-path shadows:
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Features:
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Memory information:
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 (vectors 16 11046)
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 (buffers 976 14)
 (heap 1024 36642 863))

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Philipp Stephani <p.stephani2@HIDDEN>
Subject: bug#20144: Acknowledgement (25.0.50; Functions using fboundp not
 known to be defined)
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Reply-To: 20144 <at> debbugs.gnu.org
Date: Thu, 19 Mar 2015 15:56:02 +0000

Thank you for filing a new bug report with debbugs.gnu.org.

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20144: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D20144
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severity 20144 wishlist

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Philipp Stephani wrote:

> However, the function is clearly always defined.  Since this trick is
> rather common, the byte compiler should know about it.

This issue has existed "forever". I really doubt it will ever change.

Eg http://lists.gnu.org/archive/html/emacs-devel/2007-09/msg02316.html

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This is a dupe of http://debbugs.gnu.org/8140 .

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merge 8140 20144

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Subject: bug#20144: 25.0.50; Functions using fboundp not known to be defined
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severity 20144 wishlist
thanks

> (if (fboundp 'car)
>     (defalias 'mycar 'car)
>   (defun mycar (_l) (error "what")))

   (defalias 'mycar
             (if (fboundp 'car) 'car (lambda (_l) (error "what"))))

The difference is one of the two versions requires reasoning
(simple/trivial for you, but beyond the reach of the simple
byte-compiler we're using), whereas the other doesn't.

Admittedly, when you need to define two versions of a *set* of
functions, depending on a single test, the above trick of sinking the
testing into the `defalias' ends up being a bit ugly/inconvenient.


        Stefan
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