Having puttered, I share: 

#!/usr/bin/perl -w
use strict;
use English;

use vars qw($boo);
$a = foo() if 0;

sub bar {}

END {
  no strict 'refs';
  my $table = '::';

 SYMBOL:
  for my $sym (sort {lc($a) cmp lc($b)} keys %{$table}) {
    next if $sym =~ /::$/ or $sym =~ /^[A-Z0-9]/;

    my $name = $table . $sym;
    next if $name =~ /^::\W/;

    foreach my $thing qw(ARRAY HASH IO) {
      if (defined *{$name}{$thing}) {
    next SYMBOL;
      }
    }
    print "Look at this!\n";
    unless (defined *{$name}{CODE}) {
      warn "Possible undefined routine '$sym'";
    }
  }
}

[download]
The problem is that *{$name}{CODE} is as expected, undef for symbol foo, and not undef for symbol bar, but it is also undef for symbol boo. That is, there's no way to distinguish at the symbol table level between an undefined subprogram name, and a scalar, because both will have 
  defined(*foo{SCALAR}) && !defined(*foo{CODE})

[download]
Hmph.
--
Jeff Boes
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In reply to Re: Re: "use strict" not too strict by Mur
in thread "use strict" not too strict by Mur

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