Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

This is not an answer to your question, but rather a related observation. Here's the relevant section of the docs for do (my emphasis):

  • do EXPR

    Uses the value of EXPR as a filename and executes the contents of the file as a Perl script. Its primary use is to include subroutines from a Perl subroutine library.
    do '';
    is just like
    eval `cat`;
    except that itís more efficient and concise, keeps track of the current filename for error messages, searches the @INC libraries, and updates %INC if the file is found. … It also differs in that code evaluated with "do FILENAME" cannot see lexi≠cals in the enclosing scope; "eval STRING" does.
It may not be not entirely obvious, but the underlined sentence implies that, despite the similarity of the two constructs, with do '' strictures are not enforced, but they are with eval `cat`.

In the following example, the file contains only the line $x = 1;

# use strict; use warnings; use diagnostics; do ''; print 'do: ', +( $@ ? $@ : 'ok' ), "\n"; eval `cat`; print 'eval: ', +( $@ ? $@ : 'ok' ), "\n"; __END__ do: ok Variable "$x" is not imported at (eval 2) line 1 (#1) (F) While "use strict" in effect, you referred to a global variabl +e that you apparently thought was imported from another module, because something else of the same name (usually a subroutine) is exported + by that module. It usually means you put the wrong funny character o +n the front of your variable. eval: Global symbol "$x" requires explicit package name at (eval 2) li +ne 1.

So you'll need to use eval instead of do if you want strictures, but you'll have to check $@ yourself after the eval.

the lowliest monk

In reply to Re: Can I force strictness on included files? by tlm
in thread Can I force strictness on included files? by Thilosophy

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, 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, 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.
  • Log In?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others meditating upon the Monastery: (3)
    As of 2021-04-18 02:38 GMT
    Find Nodes?
      Voting Booth?

      No recent polls found