> How can I grab all erorrs to some variable without polluting stderr?

eval {BLOCK} is only catching fatal errors, either thrown with die or from inside perl.

But these seem to come from warn

One way is to locally use a %SIG -handler.

DEMO: 

> perl -de0

...

  DB<173> eval { local $SIG{__WARN__} = sub { die $_[0] }; warn "bla" 
+} or print "<<<$@>>>"                            
<<<bla at (eval 197)[c:/nonBKU/strawberry-perl-5.32.1.1-64bit-portable
+/perl/lib/perl5db.pl:738] line 2.
>>>
  DB<174>

[download]

There is also a pragma for this redirection - use warnings FATAL =>"all"; °

But with a handler you can also choose to save the warnings to another variable separate from fatals.

FWIW: Another approach would be to locally redirect STDERR to a var...

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery

°) updated see https://perldoc.perl.org/warnings#Fatal-Warnings for more

In reply to Re: Make Spreadsheet::ParseXLSX be quiet about errors ($SIG{__WARN__} ) by LanX
in thread Make Spreadsheet::ParseXLSX be quiet about errors by leszekdubiel

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.