* bug#15103: 24.3.50; Wrong byte compiler warning
@ 2013-08-15 11:49 Michael Albinus
2013-08-15 14:50 ` Stefan Monnier
2013-10-04 3:41 ` Stefan Monnier
0 siblings, 2 replies; 4+ messages in thread
From: Michael Albinus @ 2013-08-15 11:49 UTC (permalink / raw)
To: 15103
I have a file test.el:
(condition-case err
(ignore)
(file-error (ignore))
(error (message "%s" (error-message-string err))))
When I compile it with --eval '(setq byte-compile-force-lexical-warnings t)'
I get the byte compiler warning
In toplevel form:
test.el:1:1:Warning: Unused lexical argument `err'
Wrote /home/albinus/tmp/test.elc
Note, that this warning does not appear when the first condition-case
handler does not exist.
Best regards, Michael.
^ permalink raw reply [flat|nested] 4+ messages in thread* bug#15103: 24.3.50; Wrong byte compiler warning
2013-08-15 11:49 bug#15103: 24.3.50; Wrong byte compiler warning Michael Albinus
@ 2013-08-15 14:50 ` Stefan Monnier
2013-10-04 3:41 ` Stefan Monnier
1 sibling, 0 replies; 4+ messages in thread
From: Stefan Monnier @ 2013-08-15 14:50 UTC (permalink / raw)
To: Michael Albinus; +Cc: 15103
> I have a file test.el:
> (condition-case err
> (ignore)
> (file-error (ignore))
> (error (message "%s" (error-message-string err))))
> When I compile it with --eval '(setq byte-compile-force-lexical-warnings t)'
> I get the byte compiler warning
> In toplevel form:
> test.el:1:1:Warning: Unused lexical argument `err'
> Wrote /home/albinus/tmp/test.elc
> Note, that this warning does not appear when the first condition-case
> handler does not exist.
Yup, same kind of problem as discussed in the "Cleaning up code" thread.
When compiling for lexical scoping, the condition case above gets turned
internally into something akin to:
(condition-case :use-lexical-calling-convention
(ignore)
(file-error (lambda (err) (ignore)))
(error (lambda (err) (message "%s" (error-message-string err)))))
so as you can see, we now have two separate declarations of `err' one of
which is unused.
There's a secondary bug as well in that the warning says "argument"
rather than "variable", but that's minor.
Stefan
^ permalink raw reply [flat|nested] 4+ messages in thread* bug#15103: 24.3.50; Wrong byte compiler warning
2013-08-15 11:49 bug#15103: 24.3.50; Wrong byte compiler warning Michael Albinus
2013-08-15 14:50 ` Stefan Monnier
@ 2013-10-04 3:41 ` Stefan Monnier
2013-10-08 9:35 ` Michael Albinus
1 sibling, 1 reply; 4+ messages in thread
From: Stefan Monnier @ 2013-10-04 3:41 UTC (permalink / raw)
To: Michael Albinus; +Cc: 15103
> I have a file test.el:
> (condition-case err
> (ignore)
> (file-error (ignore))
> (error (message "%s" (error-message-string err))))
[...]
> In toplevel form:
> test.el:1:1:Warning: Unused lexical argument `err'
> Wrote /home/albinus/tmp/test.elc
If you set byte-compile--use-old-handlers to nil, the above spurious
warning should now be fixed.
Stefan
^ permalink raw reply [flat|nested] 4+ messages in thread
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2013-08-15 11:49 bug#15103: 24.3.50; Wrong byte compiler warning Michael Albinus
2013-08-15 14:50 ` Stefan Monnier
2013-10-04 3:41 ` Stefan Monnier
2013-10-08 9:35 ` Michael Albinus
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