I have a testing routine which, as part of the test, calls a function in a way that generates a warning message. I am expeting this warning message and would like to supress it in order to have clean test output. However I only want to supress the warning message for this instance of the function call and I want to keep any other error messages that might occour.

I have tried using the 'no warnings qw/type/' pragma but have run into what seems to be a block nesting problem. According to perllexwarn the warnings pragma works on a block level which is fine. My problem seems to be when trying to control runtime warnings the scope doesn't work as I'm expecting: 
#!/bin/perl 
use warnings::register;
use warnings;

printf( "Perl Version: %vd\n",$^V);
test_warnings();

sub GenerateWarning {
    warn  "warnings are ",
            warnings::enabled() ? "" : "not ",
            "enabled\n";
}

sub test_warnings {
    no warnings;
    GenerateWarning();
    AnotherSub();
}

sub AnotherSub {
    GenerateWarning();
}

[download]
Produces the output: 
Perl Version: 5.6.1
warnings are not enabled
warnings are enabled

[download]
What I would like is for warnings to be not enabled both times. Is there a way to do what I want to do? Should I be doing this a different way?

In reply to Nested runtime warning disabling by kryten

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.