Unfortunately, that gives a warning.

I note that:

  use strict ; use warnings ;

  our $inner = "SET" ;

  sub inner {
    my ($s) = @_ ;
    print "$s  outermost inner \$inner=$inner\n" ;
  } ;

  print "outermost start\n" ;
  inner('') ;
  buddy('') ;
  wrapper('') ;
  buddy('') ;
  print "outermost end\n" ;

  sub wrapper {
    my ($s) = @_ ;

    print "$s  wrapper entered\n" ;
    inner($s.'  ') ;

    local *inner ### ; print "$s  *** separate local\n" ; *inner
      = sub {
          my ($s) = @_ ;
          $inner ||= "NOT SET" ;
          print "$s  innermost inner $inner\n" ;
        } ;
    inner($s.'  ') ;

    buddy($s.'  ') ;
    print "$s  wrapper exit\n" ;
  } ;

  sub buddy {
    my ($s) = @_ ;
    print "$s  buddy entered\n" ;
    inner($s.'  ') ;
    print "$s  buddy exit\n" ;
  } ;
[download]

gives:

outermost start
  outermost inner $inner=SET
  buddy entered
    outermost inner $inner=SET
  buddy exit
  wrapper entered
    outermost inner $inner=SET
Subroutine main::inner redefined at zz.pl line 29.
    innermost inner SET
    buddy entered
      innermost inner SET
    buddy exit
  wrapper exit
  buddy entered
    outermost inner $inner=SET
  buddy exit
outermost end

showing the same warning. Also the value of $inner is unaffected by the local -- which may or may not be a surprise.

But if you remove the ### in the code above, to make that line:

    local *inner ; print "$s  *** separate local\n" ; *inner
[download]

that gives:

outermost start
  outermost inner $inner=SET
  buddy entered
    outermost inner $inner=SET
  buddy exit
  wrapper entered
    outermost inner $inner=SET
  *** separate local
    innermost inner NOT SET
    buddy entered
      innermost inner NOT SET
    buddy exit
  wrapper exit
  buddy entered
    outermost inner $inner=SET
  buddy exit
outermost end

NB: using the stand alone local *inner is undefining all parts of *inner.

I guess that the '=' is doing special things to assign the rhs to the right part of the lhs GLOB, so this is not a run of the mill assignment. Could this be why the presence of the initialiser appears to change the effect of local on a GLOB ?

You will recall that in another thread Setting signal handlers considered unsafe? it was established that  local $SIG{ALRM} = ... that the local sets the lhs undef before the assignment takes place. Which this isn't consistent with !

---

---

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! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

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:
	&		&
	<		&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.