Why does this work:

unless (open (QTREES, $file))  {
    print STDERR "WARNING: get_qtrees() can't open $file for filer $fi
+ler!\n";
    return;
};

[download]

But this doesn't work:

open (QTREES, $file) or {
    print STDERR "WARNING: get_qtrees() can't open $file for filer $fi
+ler!\n";
    return;
};

[download]

Basically, I'm trying to change a "open or die" command to an "open or do this list of things" command.

I get a compilation error. It looks like it might have to do with the scope of the variables:

syntax error at ~chayashida/Perl/Module.pm line 872, near "return"
Global symbol "$filer" requires explicit package name at ~chayashida/P
+erl/Module.pm line 880.

[download]

I have the code working using the first version, but I'm curious why the second version doesn't work.

Thanks in advance,

Chris

In reply to unless vs. bare block by chayashida

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.