Beefy Boxes and Bandwidth Generously Provided by pair Networks
Welcome to the Monastery
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
> As for there being a new warning for if(1){X:...} goto X:, I lack the details for why this got deprecated.

It's analogous to if(0) the constant block is optimized to a do-block╣ ...

> perl -MO=Deparse -E'if (1) { label: say 1;}; goto label' BEGIN { $^H{'feature_say'} = q(1); $^H{'feature_state'} = q(1); $^H{'feature_switch'} = q(1); } do { label: say 1 }; goto label;

... which seems to fall into the same category like other loop-like-blocks:

ATM I have only 5.10 available. Could someone please test this with >= 5.12?

perl -wE'do { label: say 1;}; goto label'

EDIT: removed exit

Update

here test code w/o endless looping.

perl -wE'my $x=0;do { label: say $x++; die if $x>1}; goto label' 0 1 Died at -e line 1.

Update

Thanks to davido for testing

[davido]: LanX: perl -E 'goto IN; do{ IN: say "Hello world\n";};' does + produce the warning on 5.16.2.

Cheers Rolf

╣) which is somehow strange, I expected a simple bare block.


In reply to Re^2: How does 'goto LABEL' search for its label? (do-blocks) by LanX
in thread How does 'goto LABEL' search for its label? by moritz

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!
  • 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
  • Outside of code tags, you may need to use entities for some characters:
            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?
    Username:
    Password:

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

    How do I use this? | Other CB clients
    Other Users?
    Others chilling in the Monastery: (15)
    As of 2014-07-25 13:53 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      My favorite superfluous repetitious redundant duplicative phrase is:









      Results (171 votes), past polls