Re: Using the syntax checking feature in vim perlsupport plugin

[hippo]

Those messages are warnings, so if you really don't want to see them you can bracket your use statements like this:

no warnings;
use WWW::Mechanize;
# ... other use statements here
use warnings;

But I don't advise that because you'll miss out on messages like "Constant subroutine StevesPerlTools::DATA_DIR redefined" which sounds to me like something requiring fixing. If the third-party modules on their own compile without warnings then again these likely indicate some problem with the way you are using them. OTOH, if the warnings persist when the modules are compiled stand-alone that's probably worth bringing to the attention of the module author.

If there are warnings or errors reported from the syntax check just hit return and it will take you to where the error occurred in your code. Fix that, re-run the syntax check and the other window will refresh with the new report. Keep doing that until they're all gone and you'll simply have the line "file.pl : Syntax is OK" in your status line.

[nysus]

So the warning that WWW::Mechanize is giving is from this subroutine here:

sub _is_tainted {
    no warnings qw(void uninitialized);

    return !eval { join('', shift), kill 0; 1 }; 
} # _is_tainted

The code says to ignore the void warnings so I'm not sure why perlsupport is complaining about it. Any fix?

[hippo]

My version of WWW::Mechanize gives no such warning:

$ cat wwwm.pl
use strict;
use warnings;
use WWW::Mechanize;
$ perl -cw wwwm.pl
wwwm.pl syntax OK

Either you are loading it differently or you are on a different version of WWW::Mechanize - mine is 1.74

[nysus]

Yeah, I'm on 1.73 but when I looked at the source for 1.75 it had the same exact lines so I didn't bother to install it. I'm invoking it the same way you are.

I guess I'll try upgrading. I installed the module using Debian package manager. What's the best practice for overriding the stock Perl module in Debian? This is another area I'm weak on.

Update: This thread looks like a pretty thorough discussion of the options: http://www.perlmonks.org/?node_id=753416

[nysus]

OK, managed to create a backport and confirmed that my script is now using version 1.75 of WWW::Mechanize. I'm still getting that damn warning, though. Do you think it might be my version of Perl? Update: I'm using perl 5.20.2.

[nysus]

I tried the no warnings/use warnings trick you suggested but I'm still getting the warnings. I'm only getting the warnings from within vim. When I use perl -c command from the command line, I get no warnings (with or without trying to turn warnings off using the no warnings/use warnings trick).

I've posted a new question about this problem at SOLVED: How to get rid of "void context" warnings when using vim's perl-support plugin