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Re: Declaring a local dynamic variable?


From: Barry Margolin
Subject: Re: Declaring a local dynamic variable?
Date: Sat, 21 Sep 2013 23:49:29 -0400
User-agent: MT-NewsWatcher/3.5.3b3 (Intel Mac OS X)

In article <address@hidden>,
 Andreas Röhler <address@hidden> wrote:

> Am 21.09.2013 13:31, schrieb Barry Margolin:
> > In article <address@hidden>,
> >   Andreas Röhler <address@hidden> wrote:
> >
> >> Am 20.09.2013 22:59, schrieb Barry Margolin:
> >>> In article <address@hidden>,
> >>>    Andreas Röhler <address@hidden> wrote:
> >>>
> >>>> Am 20.09.2013 17:10, schrieb Barry Margolin:
> >>>>> In article <address@hidden>,
> >>>>>     Andreas Röhler <address@hidden> wrote:
> >>>>>
> >>>>>> Am 20.09.2013 14:30, schrieb Stefan Monnier:
> >>>>>>>> If I purposefully use a local dynamic variable as in:
> >>>>>>>
> >>>>>>> Use (defvar my-counter) at the file's top-level to indicate that this
> >>>>>>> variable is used in a way that relies on dynamic scoping.
> >>>>>>
> >>>>>> A need to write code just to silence compiler warnings?
> >>>>>> Emacs could do better.
> >>>>>
> >>>>> Other than "code", what would you suggest?
> >>>>
> >>>> In the precise case: just drop that warning.
> >>>>
> >>>> In a wider sense, IMO a modular approach is better.
> >>>> Restrict compiler warnings to obvious errors, don't mix style questions 
> >>>> in.
> >>>
> >>> This isn't a style warning. Often the reason is mistyping a local
> >>> variable name.
> >>>
> >>> (let ((foobar ...))
> >>>      ...
> >>>      (blah fobar)
> >>>      ...)
> >>>
> >>
> >> This is another case. IIUC there was nothing wrong with the OP's example.
> >
> > But how is the compiler supposed to know the difference?
> 
> A code-checker might look up, if a variable is defined.
> If our eyes may notice the difference, why a checker should not?

Look up where? How does it know you're going to load the package that 
declares the variable later?

The warning doesn't happen if you've already loaded the package.

-- 
Barry Margolin, address@hidden
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***


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