GNU bug report logs -
#14883
warning about unused returned value from some ert shoulds
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Reported by: Glenn Morris <rgm <at> gnu.org>
Date: Tue, 16 Jul 2013 20:18:01 UTC
Severity: minor
Found in version 24.3
Done: Stefan Monnier <monnier <at> iro.umontreal.ca>
Bug is archived. No further changes may be made.
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bug#14883
; Package
emacs
.
(Tue, 16 Jul 2013 20:18:01 GMT)
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Message #3 received at submit <at> debbugs.gnu.org (full text, mbox):
Package: emacs
Version: 24.3
Severity: minor
Compiling a file with contents:
;; -*- lexical-binding: t; -*-
(require 'ert)
(require 'cl-lib)
(defvar foo-test 1)
(should foo-test)
(cl-assert foo-test)
results in a warning (for some reason, only when lexical-binding is t):
foo.el:5:1:Warning: value returned from (car value-94600) is unused
The warning is from the `should'. Obviously it is a bogus warning
because the whole point of the should is to test the return value.
The similar cl-assert does not trigger a warning, because internally
cl-assert is written differently.
This is the same issue as http://debbugs.gnu.org/10969, for what is now
cl-pop.
byte-optimize-form-code-walker has special handling for the standard
`pop' macro so as not to warn about unused return values from (pop foo).
It would be nice if there was a general way to get the same result for
arbitrary macros (sort of the opposite of side-effect-free?), but I
don't see how.
Information forwarded
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bug-gnu-emacs <at> gnu.org
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bug#14883
; Package
emacs
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(Mon, 22 Jul 2013 15:35:01 GMT)
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Message #6 received at 14883 <at> debbugs.gnu.org (full text, mbox):
> This is the same issue as http://debbugs.gnu.org/10969, for what is now
> cl-pop.
There's no `cl-pop'. Instead `pop' is now always like CL's `pop'.
> byte-optimize-form-code-walker has special handling for the standard
> `pop' macro so as not to warn about unused return values from (pop foo).
> It would be nice if there was a general way to get the same result for
> arbitrary macros (sort of the opposite of side-effect-free?), but I
> don't see how.
I think the way to do it is to introduce a new function (call it
`ignorable') which works like `identity' and then make pop use it around
the code that returns the value.
Then byte-optimize-form-code-walker can be modified to recognize this
function and just throw away the whole call when `for-effect' is nil.
We can then get rid of this ad-hoc handling of `pop'.
Stefan
Reply sent
to
Stefan Monnier <monnier <at> iro.umontreal.ca>
:
You have taken responsibility.
(Thu, 05 Sep 2013 03:07:02 GMT)
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Notification sent
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Glenn Morris <rgm <at> gnu.org>
:
bug acknowledged by developer.
(Thu, 05 Sep 2013 03:07:02 GMT)
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Message #11 received at 14883-done <at> debbugs.gnu.org (full text, mbox):
> Compiling a file with contents:
> ;; -*- lexical-binding: t; -*-
> (require 'ert)
> (require 'cl-lib)
> (defvar foo-test 1)
> (should foo-test)
> (cl-assert foo-test)
> results in a warning (for some reason, only when lexical-binding is t):
> foo.el:5:1:Warning: value returned from (car value-94600) is unused
This `car' came from the closure conversion. I believe it is now fixed
in the trunk. Thank you.
Stefan
bug archived.
Request was from
Debbugs Internal Request <help-debbugs <at> gnu.org>
to
internal_control <at> debbugs.gnu.org
.
(Thu, 03 Oct 2013 11:24:02 GMT)
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This bug report was last modified 10 years and 221 days ago.
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